all depends how far you want to go
you dont need a machine, it can all be done by hand, but obviously on real old/faded paint work , a machine buff is better/needed
but..
wash
clay bar
g3 scratches and swirl
then farclia paint renovator
autogym super resin polish
then a wax
liquid waxes are ok,easy to put on, but..ive found the tinned simoniz caranuba wax, £7.99 in halfords, is by far the best shine and durability, although a ball ache to do a whole car, it lasts 5 times longer than any liquid wax ive tried
also a tip...paints4u.com , buy a tin of touch up paint in your color-ive found the ones ive tried to be perfect match, its £10 odd, and a little paitn brush , carefuly paint in a deep scratch with it , leave for a week or 2 , it will look rough of course but dont worry, after the paints settled for a a week or 2, then g3 it gently by hand with a waffle pad, and it will blend in nicely and youl be quite amazed how good it looks !