Sinn1612 gave useful advice, mine is to start with tires, then you have to know how much camber and toe (tire alignment) that particular tire likes, that way you will always land at a given geometry at a given ride height(if the tire likes -2º of camber no way a geometry that makes them never stay at -2º will be good), then springs and roll bars to keep chassis movement in check, now shock oil/pistons to keep the tires on the track and diff fluid to keep them from spinning wildly different. Did I miss something?