dude, you n00b

.... hit the morrowind forums!!! they have HUGE stickied posts with answers to all this in a usually easy to read format:
Morrowind hints forum
the talking mudcrab near vivec has 10k and pays full price for things, but its annoying to travel to:
its easier to just use the morrowind editor, change all pawnbrokers to have 100k and save it as a plugin that you use. voila, no roaming, and you can sell stuff anywhere

actually, i have a plugin for that (i think, or i can make it quickly anyway), pm me and i can email it to you when i get home.
cant buy ebony armor, have to find it, but it abounds. try a daedric ruins.
once youre a guild head youre done with it, try a different guild or group. you can do house quests for redoran, telvanni (i think) and that other group. the redoran quests suck so stay away from them. do the main quest if you havent. i didnt like tribunal but bloodmoon was good, very tough, but good.