Have you unpacked the game?.
HowTo: Set up MTW2 for modding
Unpacking: The very first steps & simplest method for new modders
The unpacker, Using Vista
How to unpack something specific from the .pack files
How To Fix UAC and VirtualStore Problems
MODDING UNITS
Be a Modder: Doctoring of Medieval 2 units
How to create a dismounted knight
How to edit M2TW MESH
M2TW: How-To: Add other faction units for new factions
How To Make New Units
How to add a new unit into game
Modfolder requires Kingdoms
Download Retrofit Mod 1.0
Creating a World - Bare Geomod