Can someone break this done for me? Modding a unit

[acctingman]

OK

I know there is a tutorial out here, somewhere on how to mod, but can someone give me a basic rundown on how to add/create a single unit and add it to the game so I can play/use it in skirmish mode? For instance.....a US M4A1

Can someone write up a simple tutorial, or what takes place to make a single unit and how to add it to BA2?

Thanks for any help

[acctingman]

Subject line should have read "break this down for me".....ugh