Well, I'm REALLY new at all this stuff, so you might want a second opinion.
I believe you are correct. With a single drive, RAID is disabled automatically.
As for other settings....I haven't got that far yet. I know after putting all the hardware together, the first thing I did (after making sure everything (DVD player, HD, memory, CPU was recognized) was go into the bios and make sure the dvd player was the first thing to boot.
Sorry, I know that's not much help. I haven't got any farther than that as I'm having difficulties getting an OS on the system.