Help! BIOS on SuperMicro 7033A-T

Please advise! Bought components for new DV workstation, assembled it with professional help, brought home, tried to install Win XP Pro. Details: Dual Xeon 3.06 533FSB, ATP 1GBx2 ECC reg mem., 1ea 74GB SATA WD HD (for sys drive), 2 250GB SATA WD (for A/V storage), 1ea Pioneer 8x8 burner, ATI FireGL X2-256 video card, Audigy Platinum Pro sound card. All of this is inside a SuperMicro 7033A-T workstation chassis with X5Dal-TG2 mainboard. Dual BenQ LCD. I want the 74GB to be sys drive and the 2ea 250GB to be storage with RAID1 mirror. Q: What is the sequence of BIOS installation? How do I determine how much partition space to use and on what drives? (I want sys drive to hold all programs)! At what point in process do I load drivers for each device? The OS will not load properly for some reason and when I power off/back on I get a message that (NTLDR is missing). I dont know what this means. Also, getting prompt " Press any key to boot from cd". Which CD? Win XP or SupMic Install? Either way, the system does not respond and I must shut down and begin again. I am new to this (builds) as you can tell! Please help if you can. (706) 317-5570 if easier. Thanks, B.

What does "the OS will not load properly" mean? I would put in just the system drive first, get set up, then worry about setting up the RAID.
You said you had professional help w/ the build, can you just have them sort things out for you?

The OS will not load at all... or at least it never finishes. I would like the guy who helped me build to also help me sort this out but he is out of town. I remember him installing the sys drive only and trying to install win but had no luck.

Well, strip the system down to just the essentials: ram, video, hard drive (1). See if that works. Post any errors you get if it doesn't. What power supply do you have? You need somethign pretty robust with all that hardware.
Try using a different hard drive.
Try booting with a boot disk floppy.
Can you get into bios? Check the settings there, be sure its recognizing everything.
Be sure you don't have any non boot-disk floppies in a drive, that can cause the NTLDR error, as can trying to boot from an unbootable cd, or incorrect hard drive setup in the bios.
Are all the drives new, with no previous OS installed?