I was in the same place some time ago. I did so much research and it started to get confusing. This is my conclusion but I am no pro, however I got really good results. Feel free to correct me if I mislead - anyone...
01. Get a DA polisher - this is Dual action. safe and easy to use. 5.5 or 6 inch. multi speed
02. should come with a backing plate, some have both the 5.5 and 6 inch included. this is what the pads stick on to.
03. get a range of pads for whatever backing plate you get, only get quality pads, black, white, and yellow [I think...] some people prefer microfibre for really deep scratches
04. use quality abrasives. sometimes they are called 101,102, 103 or whatever. this is where it really gets funky. everyone has their own opinion on what is best and most detailers have multiple brands and cutting compounds. Just choose one type and follow the instructions as you will do OK. Don't get too bogged down on this - it never ends.
The skill comes in choosing the right cutting compound for the paint hardness, the level of scratches and the speed to get the proper finish. the motto is "
do the least harm' so start off with the least cutting compound, least cutting pad, and slower speed [fast seems to buff and make it really shine].
Watch every youtube vid you can get - try the junkyard man he is good and down to earth but rambles on. NY AMMO is awesome but he is a OCD perfectionist but well worth watching.
and MOST important.
Wash, clay, dry, then start detailing. If your car or equipment is dirty you will wish you never attempted to detail it yourself. I paid $$ to a professional that screwed up the paint on my Suzuki some time ago -hence from now on I do it myself.
Very little compound is actually needed and don't get anything too wet as it casts off and is a mongrel to get out of the hood!
Cheers,