Aye,
here is the forum you want to visit. And
this is the topic you want to read.
You should know that you can't make make an uber mod within a few hours or even within days. Learning the process of changing things without screwing it up takes patience, and then you have to start with the mod itself. Though it is always nice to just edit things at random ^_^.
Mods can't be played on Battle.net unless you have send the others the mod as well (it's an .exe file).