There's plenty of INFINITI engine mods avaliable from
http://www.teambg.net/. Baldur's gate is not the easiest game to mod, but it's not the most difficult. If you're just learning to mod, i'd seriously recommend starting with a fallout/fallout 2 mod-fallout uses the same file system as the other games ( although it doesn't use the infiniti engine) , and it gets you into understanding how the overide systems work. There's plenty of good fallout modding sites out there as well. But there's more, i would also reccomend Morrowind's TES construction set for it's ease of use, and like Andy Igoe said, there's Neverwinter Nights (which got me annoyed because i couldn't import my character from BG2). Have a look.
-Dave
Your soul...it tastes like chicken
Official Website Postponed