The new guy from IL

Hey my names Joseph, I just recently bought a black on black 94 Mustang GT just got done doing a little tune up..spark plugs,fuel filter,oil,oil filter, airfilter,etc.. and now looking to make improvements to get some more horses any suggestions on what i should do? I've gotten a thought in my head but I want to get other peoples ideas. Oh and if i can get some websites on mustang parts it would be great ive looked around already but i always like to get a good deal on my stuff ..I'll post pictures later on thanks!