$300 would be tough.. when i started i spent close to that with a
PC and not even close to what i needed.. I would definitely invest on Makita rotary.. Ask Phil at DB or Amazon.. about $180 for the rotary and spend the rest on Menzerna kit from DB. that will cover your $300.. but youll need other random stuff:
-Lots of Microfiber towels
-Clay bay
-Spray detailer for lube
-Foam pads with backing plate
-masking tape
-Wax or sealant
-pre wax cleaner
... that is just parts of it.. you can browse through this thread on SHOW and SHINE and itll give you an idea on what people use ... GOOD LUCK and WELCOME