1. Every petty, Lesser and common soul gem should be filled with the best soul possible and sold for rediculous profit eary in the game. An empty petty soul gem is worth 10 gold but on with a rat soul is worth 100 gold. 1000% profit! I actualy have trouble getting rid of filled common soul gems because the average vendor can't afford them. Filled greater and grand soul gems are impossible to sell because of how much they're worth so you may as well save them for enchanting.

2. If you have Tribunal you should take advantage of the several good shops in mournhold. There are many good shops that have thousands more gold to buy your loot with than any of the shops on Vvardenfell (with the exception of the infamous mudcrab merchant.)

3. Sort of an old one but sujama is a melee character's best friend. It's cheap, it gives you wicked strength bonuses and it can be stacked like nobody's business. With a little luck (regarding chances of hit and getting hit) you can use it to kill virtualy anything bigger than you at virtualy any level.