Hello and welcome to the forum. with new mb out there the raid controller is now built into the chipset of the motherboard. to use it all you need to do is plug your drives your going to use for raid onto the sata ports that are raid ready. (it be in the mb guild that online or with the mb). once you connect the drives to the right port you just go into the bios at power up and go into the sata settings in device set up. most have three settings (default (achi)) ide for older cd-rom and os. and raid. once you turn on the raid in bios save and exit. at power up a new menu will show the intel or third party raid controler. if it intel you have to hit control i at the same time to get into the raid menu. once there you can set up your raid.
Upside is that motherboard RAID works pretty well depending on the controller and it is relatively inexpensive. Downside is that it will be difficult, if not impossible, to move the array to a new computer or motherboard.
Card based RAID is generally much more portable because you can move the entire subsystem (card and drives) as a single unit. Performance is also better. But the extra card is more expensive.