Be careful of believing everything you read in the tuts . Most have mistakes or skip over some detail.
Start with the tools. I would guess most people give up second time around deleting everything including the game and trying again. You need the tools
http://wiki.modsrepository.com/index.php?title=Call_of_Duty_:_Map_Editor_Setup
Zeroys wiki is easiest to look through after that there are maybe 4 others. After you get the tools working hit me up with a pm I'm on say 8 ish to noon ish est most days. Good luck and just so you know the beginning is a steep steep learning curve but once your over that and with some patience maps are easy enough to do