Have you read through all of those links that I posted for you before?

They fully explain the process of bringing out the best shine, removing swirls, etc.
I'm not sure how to advize you with that buffer. All of my knowledge comes from using the PC with certain agressiveness out of pads. I'm not sure about how it works with bonnets. I'm sure someone else will chime in and know.
You're not going to be able to find DACP or PI-III MG in an autoparts store. If you don't want to order it online you can try checking some body shop supply stores in your area. They should have one or the other, or both.
Please, do read around the site. All the information is there you just have to find it. You'll get a lot more out of Autopia if you do the reading first. The steps that you choose have to be in line with what you're willing to devote to the project. If you work the DACP properly, you may be okay with going straight to a wax. If you want more gloss, you can use a less agressive product in between like GEPC or VM. Then you have to pick what you want to use as the finish. Do you want a carnuaba, a sealant or something in between? That decision will make a difference on your prep. You can't put a sealant on over something with oils without stripping them first...
Its just too much to explain in one post. Gotta do the reading
If It were my car I'd probably take the Walmart polisher back and get a PC, just because its easier to work with because of the echangeable pads. Not saying that polisher is useless, I've never used one, its just the PC is such a great tool that it more than pays for itself. Do you have any tool rental places around? You may be able to even rent one...
I would DACP with a yellow pad, followed by PI-III-MG with a white pad to clean up any marring, then something like GEPC, VM, or Poorboys PWC to bring up the gloss. Then I would use a product like Poorboys EX because its so forgiving on swirls and prior prep.
How often do you want to add protection? Something like a carnuaba is going to need to be done once a month or so. Something like the EX will buy you a few months, something like Klasse or Zaino will last much longer. BUT, you can't use any of those swirl hiding polishes like GEPC, VM or PWC so your prep has to be spot on to get the best results...