I have a 1997 s-10 blazer with sealed beam headlights what all do i have to do to put composite lights in?

 

what do you mean composite light?
if you mean HID you can just slap in a hid kit with is a conversion bulb and a ballast, but i would recomend buying aftermarket projector lights if they fit the budget.
i have hids in all my cars. unfortunately i havent been able to find aftermarket projector headlights for my jimmy so i just have the hids in there, they throw more light all over but thats because of the reflectors. my jimmy has low beams and fog hid.
i know they make projector headlights for the blazer...if you see any for a gmc please met me know.