Title says all. Make sure you have USB XTAF in order to get the mpdata on your desktop. The program is rather easy to use to be honest. Everything is right where you can see it, click Unlock Everything to have the obvious happen, and click the About section to get the weapon ID's and whatnot.
For experience, the first one of course, make sure its set to at least 2535000 to be considered level 70, and set your prestige to the choice you want.
Click Go Advanced to even create a weapon class suggested for each map. Overall this is pretty fun to use to learn what weapons suit you best online if you havent unlocked everything already. Best of luck, download is located at the link below.
http://gamesinister.com/forum/showthread.php?960-MW2-10th-Prestige-Split-ScreenHave fun with everything unlocked.