all you need to do is hit up advance auto parts.

get aircraft stripper to get all the clear coat off

sand with like 200 grit, then 500 grit, then 800 grit, then 1000 grit, then 2000... you can skip some of them if you feel like, but that would be a good baseline. after the 2000 grit get some mothers alum. polish and get a polishing thing (sorry im not very good at technical terms) but a polishing bit for a drill and polish them.

thats what ive always done..