diff --git a/src/index.ts b/src/index.ts
index 831af79..259288f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,8 +1,14 @@
 import joplin from 'api';
+import { fetchAllNotes } from './notesFetcher';
 
 joplin.plugins.register({
 	onStart: async function() {
-		// eslint-disable-next-line no-console
-		console.info('Hello world. Test plugin started!');
+		try { const notes = await fetchAllNotes();
+			// eslint-disable-next-line no-console
+			console.info(`Note Graph Plugin started. Total notes fetched: ${notes.length}`);
+		} catch (error) {
+			// eslint-disable-next-line no-console
+			console.error('Error fetching notes:', error);
+		}
 	},
 });
diff --git a/src/notesFetcher.ts b/src/notesFetcher.ts
new file mode 100644
index 0000000..343b606
--- /dev/null
+++ b/src/notesFetcher.ts
@@ -0,0 +1,101 @@
+import joplin from 'api';
+
+export interface Note {
+    id: string;
+    title: string;
+    body: string;
+    parent_id: string;
+    created_time: number;
+    updated_time: number;
+    tags: Tag[];
+    links: string[];
+}
+
+export interface Tag {
+    id: string;
+    title: string;
+    created_time: number;
+    updated_time: number;
+}
+
+function extractLinks(body: string): string[] {
+    const linkPattern = new RegExp(':/([a-f0-9]{32})', 'g');
+    const matches: string[] = [];
+    let match;
+    while ((match = linkPattern.exec(body)) !== null) {
+        matches.push(match[1]);
+    }
+    return matches;
+}
+
+async function buildNoteTagsMap(): Promise<Map<string, Tag[]>> {
+    const noteTagsMap = new Map<string, Tag[]>();
+    
+    const tagsResponse = await joplin.data.get(['tags']);
+    const allTags = tagsResponse.items || [];
+    
+    for (const tag of allTags) {
+        const notesResponse = await joplin.data.get(['tags', tag.id, 'notes']);
+        for (const note of notesResponse.items || []) {
+            if (!noteTagsMap.has(note.id)) {
+                noteTagsMap.set(note.id, []);
+            }
+            noteTagsMap.get(note.id)!.push(tag);
+        }
+    }
+    
+    return noteTagsMap;
+}
+
+export async function fetchAllNotes(): Promise<Note[]> {
+    const noteTagsMap = await buildNoteTagsMap();
+    const notes: Note[] = [];
+    const fields = ['id', 'title', 'body', 'parent_id', 'created_time', 'updated_time'];
+    let page = 1;
+    let hasMore = true;
+
+    while (hasMore) {
+        const response = await joplin.data.get(['notes'], {
+            fields,
+            limit: 100,
+            page,
+        });
+
+        for (const note of response.items) {
+            const tags = noteTagsMap.get(note.id) || [];
+            const links = extractLinks(note.body);
+            notes.push({
+                ...note,
+                tags,
+                links,
+            });
+        }
+
+        hasMore = response.has_more;
+        page++;
+    }
+
+    return notes;
+}
+
+export async function getAllTags(): Promise<Tag[]> {
+    const response = await joplin.data.get(['tags']);
+    return response.items || [];
+}
+
+export async function getNotesWithTag(tagId: string): Promise<Note[]> {
+    const noteTagsMap = await buildNoteTagsMap();
+    const response = await joplin.data.get(['tags', tagId, 'notes']);
+    const tagNotes: Note[] = [];
+
+    for (const note of response.items || []) {
+        const links = extractLinks(note.body);
+        tagNotes.push({
+            ...note,
+            tags: noteTagsMap.get(note.id) || [],
+            links,
+        });
+    }
+
+    return tagNotes;
+}
\ No newline at end of file