Buckets of elbow grease and access to an unlimited supply of water, And, er, that's about it.
It's a bit of a cop out reply, but if you are going for the Werkstat (I would, easy application and nice results), call Rich and ask him to advise you on what he thinks you need. He won't push anything needlessly, easy to deal with and if he doesn't have it he'll recommend somebody who does.
It's difficult to write out a list because you don't have a PC or rotary, pressure washer etc and you may not want to chuck money into those things.
May seem a bit extreme but unless you actually enjoy polishing your car but you want it looking its best, I'd recommend a correction detail by a pro and then products to keep it fresh.