I was in Kmart this afternoon and they have a 10" random orbital buffer for $24.95. It includes some bonnets, too. Don't know if your local Kmart has the same thing, but I'm sure you can find something similar at Wal-Mart, Target, Auto Zone, etc. This is a MUCH safer way to do your paint. And rubbing compound with a high-speed buffer sounds like the equivalent of sticking the side of your face on a belt sander. Try POLISHING compound instead. Maybe wetsand with 1800 or 2000 grit first (lube up your water with some dish soap

) then go over it with the polishing compound on the random orbital. Then finish off with a nice coat of your favorite wax. I use "Super Glaze" by The Wax Shop, but Merguiar's, Zano, Turtle Wax ... anything will work.
I made the mistake of compounding my whole hood with rubbing compound a long time ago. I did it by HAND and it nearly ruined my paint. Don't even THINK about doing it with a high-speed buffer!!!!
Oh ... one last thing ... some brands make a non-abrasive liquid compound that really works wonders on paint if you use them with a random orbital. The Wax Shop (you have to buy this Wax Shop stuff online) used to have a product called "Dark Magic" ... I think it might be discontinued ... and they have another called "Safe Cut" that I use all the time. Might want to check into that, also.