Newbie in need of Suggestions/Resources....

I have a 1989 Buick Century Wagon and want to start doing some modifications:

Stereo/Amp/EQ
Lighting/Interior
Push button/Remote starter
Any Engine mods
Basically everything.

Can someone point me where I can find more info I whats good and what has been done to my make and model vehicle? I have checked that one site where people post pics of there own cars and stuff they have done. I would appreciate any web sites, magazines, documents that may help me in learning about my car and what I can do to it.

Thanks

Will need engine and tranny info first. Somebody here will then be able to advise.

V6 2300 Fuel Injection Transmission unknown