RAID is pretty easy on a built in controller, just check your mobo manual, normally towards the back somewhere. The drives work best when they are identical but dont have to be, but they will step down to meet the performace of the lower drive.
Raid 1 is mirrored like you say, Raid 0 is striped where you are most likely to see a performance increase but is risky as if one drives fails thats your whole raid gone.
RAID 0+1 is pretty good as it is a mirrored raid 0, it needs 4 drives though. You have your first 2 which are striped and the second 2 are an exact copy.
Personally I like RAID 5, which needs a minimum of 3 drives. It stripes across all 3 but also stores information about what's on one drive on another drive. It can get a bit complicated to explain but basicly in 5 if one disk fails, a replacement disk can be put in and it is rebuilt.