diff --git a/module/actor.js b/module/actor.js
new file mode 100644
index 0000000..927ed37
--- /dev/null
+++ b/module/actor.js
@@ -0,0 +1,54 @@
+import { SoSUtility } from "./sos-utility.js";
+
+
+/* -------------------------------------------- */
+/**
+ * Extend the base Actor entity by defining a custom roll data structure which is ideal for the Simple system.
+ * @extends {Actor}
+ */
+export class SoSActor extends Actor {
+
+  /* -------------------------------------------- */
+  /**
+   * Override the create() function to provide additional SoS functionality.
+   *
+   * This overrided create() function adds initial items 
+   * Namely: Basic skills, money, 
+   *
+   * @param {Object} data        Barebones actor data which this function adds onto.
+   * @param {Object} options     (Unused) Additional options which customize the creation workflow.
+   *
+   */
+
+  static async create(data, options) {
+
+    // Case of compendium global import
+    if (data instanceof Array) {
+      return super.create(data, options);
+    }
+    // If the created actor has items (only applicable to duplicated actors) bypass the new actor creation logic
+    if (data.items) {
+      let actor = super.create(data, options);
+      return actor;
+    }
+
+
+    return super.create(data, options);
+  }
+
+  /* -------------------------------------------- */
+  prepareData() {
+    super.prepareData();
+
+    const actorData = this.data;
+  }
+
+  /* -------------------------------------------- */
+  /**
+   * Prepare Character type specific data
+   */
+  async _prepareCharacterData(actorData) {
+    // Initialize empty items
+  }
+
+}
diff --git a/module/sos-main.js b/module/sos-main.js
new file mode 100644
index 0000000..2d3f638
--- /dev/null
+++ b/module/sos-main.js
@@ -0,0 +1,117 @@
+/**
+ * RdD system
+ * Author: LeRatierBretonnien
+ * Software License: GNU GPLv3
+ */
+
+/* -------------------------------------------- */
+
+/* -------------------------------------------- */
+// Import Modules
+import { SoSActor } from "./actor.js";
+import { SoSItemSheet } from "./item-sheet.js";
+import { SoSActorSheet } from "./actor-sheet.js";
+import { SoSUtility } from "./rdd-utility.js";
+import { SoSTokenHud } from "./rdd-token-hud.js";
+import { SoSCommands } from "./rdd-commands.js";
+
+/* -------------------------------------------- */
+/*  Foundry VTT Initialization                  */
+/* -------------------------------------------- */
+
+/************************************************************************************/
+const _patch_initiative = () => {
+  Combat.prototype.rollInitiative = async function (
+    ids,
+    formula = undefined,
+    messageOptions = {}
+  ) {
+  }
+}
+
+/************************************************************************************/
+Hooks.once("init", async function () {
+  console.log(`Initializing Shadows over Sol System`);
+
+  // preload handlebars templates
+  SoSUtility.preloadHandlebarsTemplates();
+  // Create useful storage space
+  game.system.sos = { TMRUtility: TMRUtility }
+
+  /* -------------------------------------------- */
+  // Set an initiative formula for the system 
+  CONFIG.Combat.initiative = {
+    formula: "1+(1d6/10)",
+    decimals: 2
+  };
+
+  /* -------------------------------------------- */
+  game.socket.on("system.foundryvtt-shadows-over-sol", data => {
+    SoSUtility.onSocketMesssage(data);
+  });
+
+  /* -------------------------------------------- */
+  // Define custom Entity classes
+  CONFIG.Actor.entityClass = SoSActor;
+  CONFIG.SoS = {
+  }
+
+  /* -------------------------------------------- */
+  // Register sheet application classes
+  Actors.unregisterSheet("core", ActorSheet);
+  Actors.registerSheet("foundryvtt-reve-de-dragon", SoSActorSheet, { types: ["character"], makeDefault: true });
+  Items.unregisterSheet("core", ItemSheet);
+  Items.registerSheet("foundryvtt-reve-de-dragon", SoSItemSheet, { makeDefault: true });
+
+  // Patch the initiative formula
+  _patch_initiative();
+
+});
+
+/* -------------------------------------------- */
+function welcomeMessage() {
+  ChatUtility.removeMyChatMessageContaining('<div id="welcome-message-sos">');
+  ChatMessage.create({
+    user: game.user._id,
+    whisper: [game.user._id],
+    content: `<div id="welcome-message-sos"><span class="rdd-roll-part">Welcome !</div>
+    ` });
+}
+
+/* -------------------------------------------- */
+/*  Foundry VTT Initialization                  */
+/* -------------------------------------------- */
+Hooks.once("ready", function () {
+
+  // User warning
+  if (!game.user.isGM && game.user.character == undefined) {
+    ui.notifications.info("Warning ! You are not linked to any actor !");
+    ChatMessage.create({
+      content: "<b>WARNING</b> Player " + game.user.name + " is not linked to an actor !",
+      user: game.user._id
+    });
+  }
+  
+  welcomeMessage();
+
+});
+
+/* -------------------------------------------- */
+/*  Foundry VTT Initialization                  */
+/* -------------------------------------------- */
+Hooks.on("chatMessage", (html, content, msg) => {
+  if (content[0] == '/') {
+    let regExp = /(\S+)/g;
+    let commands = content.toLowerCase().match(regExp);
+    if (game.system.sos.commands.processChatCommand(commands, content, msg)) {
+      return false;
+    }
+  }
+  return true;
+});
+
+/* -------------------------------------------- */
+Hooks.on("getCombatTrackerEntryContext", (html, options) => {
+  RdDUtility.pushInitiativeOptions(html, options);
+}
+)
diff --git a/module/sos-utility.js b/module/sos-utility.js
new file mode 100644
index 0000000..362631a
--- /dev/null
+++ b/module/sos-utility.js
@@ -0,0 +1,9 @@
+
+export class SoSUtility {
+  /* -------------------------------------------- */
+  static async preloadHandlebarsTemplates() {
+    const templatePaths = [
+    ]
+  }
+
+}
\ No newline at end of file
diff --git a/template.json b/template.json
index e451bee..915370f 100644
--- a/template.json
+++ b/template.json
@@ -14,9 +14,9 @@
       }
     },
     "background": {
-      "history": "Histoire personnelle...",
+      "history": "",
       "notes": "Notes",
-      "gmnotes": "Notes du MJ",
+      "gmnotes": "GM notes",
       "eyes": "",
       "hair": "",
       "weight": "",