You can start with a lactic acid peel which is more gentle than glycolic acid peel. I think the lactic acid starts with 30%, then 40% and 50%. You can find it on many websites and get more info there. I can't give you the link here.
TCA is Trichloroacetic Acid. It's strong because it can penetrate the epidermis, into the upper layers of the dermis. There are home TCA kits available but I wouldn't do it at home. If you have to do it look for an experienced salon or doctor.