Some help for a troubled soul

Hey guys,

I've been 100% android for a long time, but i've never delved deep into the custom Roms, Cyanogenmods, etc. I always been launcher pro or something like that, but i have a LG Thrill (Lg optimus 3d for at&t) and its awful. I got it for free and its been my phone since i had to sell my gs2. I have heard these wonderful stories of putting some sort of CM mod onto an old android phone and it magically becoming a new phone for them, but i don't have the faintest idea how to do that. I've rooted my phone, but i don't know where to go from there. My thrill has a hard time connecting to my wife's Toshiba Satellite, and i have a macbook (don't hate, i'm getting rid of it).

Can ANYONE give me a step by step instruction on how to install something on my phone to make it cool? Any help would be extremely appreciated.