GLD - PLD: This is a solid choice if you are not into having fun.
MRD - WARR: This is a solid choice if you wish to enjoy your time.

Refer to Garlyle's novel for more information. The only point I disagree with is the main tank off tank preference part, although not technically wrong, there are many a fights where you more than excel at main tanking.

Again refer to Garlyle but,
Rotation: At such a low lvl you wont have much of one. Overpower is your AoE emnity generator, and your single target will look like Heavy Swing > skull Sunder. Dosn't hurt to try to keep Maim up as well.