i am considering getting a sound system for my blazer but have no idea what to look for as in specs and all that crap please give some information so i know what to look for.

you already have a good head unit you need at least a amp for a sub, and if you have the extra money, get a 4 channel and new door speakers. Let me know and ill help you install it. Dont forget the more power you want the more wireing youll need.