First off,
Welcome to the club Fezel B) Do you have a reliable mechanic you can yake your ES to? If not, ask friends & family to recommend one. The dealers are quite expensive & yous is very close to a 1990 & 1991 Toyota Camry V6 LE so to repair them is not too difficult. I would make a list of all your concerns & take the car to your mechanic to look over & repair what is needed. Good Luck! B)
As far as customizing is concerned, you have ton's of stuff you can do to your ES from appearance to performance. I would suggest tint, front strut tower brace, a complete tune up is important & the like to start off with. Many more things can be done down the road depending on your tastes & budget. ;)