My first buffer experience was a good one... considering I was a complete newbie to machine buffing.
I painted a car white lacquer with blue pearl in about 8 coats of lacquer clear, in my opinion, for my first paint job it came out pretty good. Not having a clue as to what to do next I asked a local custom car painter and he told me to
sand it and then buff it, that was as detailed as his instructions would get.
Sand it and buff it.
So I bought some #1500 and #2000 grit wet/dry paper and sanded the entire car down. As I sanded I saw the concrete floor turn a very pretty pearlescent blue with all the paint slurry running off the car onto the floor as I sanded.
Next I went to the local tool rental store, "Snell Rental" and rented a rotary buffer. This was a Dinosaur from the 1960's and it had a wool pad on it that looked like it was from the 1960's and had seen a thousand cars. Back then I didn't know or think to purchase a new wool pad I just used what was already attached to the buffer.
The rental store sold one compound, that's it, no polishes or any options, just something in a quart container, the guy behind the counter told me it was "good stuff", so I bought a quart to go with the buffer.
I then proceeded to buff out the car to remove my sanding marks.
Back then I didn't know the difference between a swirl and a squirrel, all I know was the car started out shiny, I sanded it flat and made the paint dull, then I buffed out the paint and made it shiny again.
In my eyes it looked GREAT!
I returned the buffer and drove the car with it's brand new shiny pearl white paint job. My guess is the car was completely swirled out with holograms!
But I didn't know any better and no one around me said anything otherwise. That's just how thing use to be done. Remember this was probably 1980 or 1981, 20 years before vBulletin would be released to become what we all know as a "discussion forum".
Point being is you can start out with a rotary buffer but I wouldn't recommend learning on anything that's important to you. Instead, read, watch videos and then find either a car that no one cares about or get a hood out of a wrecking yard or from a body shop and practice.
Practice makes perfect.
I am in the camp that recommends starting with an easier tool to master if you're making the step up from working by hand to working by machine.
This would be one of these,
DA Polisher
Flex 3401
Cyclo
Then after you master one or all of the above, move onto the rotary buffer.
And if you get a chance to go to any type of detailing class with a person who has a good name in this industry, by all means sign-up for the class and go to it ready and expecting to learn.