If you do it right, the AH is going to be your God. You can sell mageweave (depending on your server) for 1 gold a stack, and it'll sell quick. Since, it usually costs 1 gold and 20 silver.
QUEST QUEST QUEST!!!
If you do your quests solo, you'll get any coin drops from anything you kill...plus and items they drop that can be sold.
Keep in mind, all WHITE items have some value to someone, so putting them up on the AH for a little cheaper than everyone else has the same thing will help to ensure that it sells faster.
You can ask higher levels to run you through instances for gear/money, ect. In SM, the graveyard doesn't drop anything really, but there is a quest you can pick up in there.
And, if you happen to be on Blackhand, I can help you out a bit.
Also, if you have a guild and someone has a level 60 or two, chances are that they have enough gold to lend you (this is what I did). But, basically, you will need like 120 gold. I know, horse/riding skill is only like 100, but you will need to buy your spells. >.> (Bank breaking level.)
Last, but not least, cloth quests. They yeild small amounts of experience but if you do the cloth quests for Undercity, it will earn you reputation and you can use that to your advantage because it will help to lower your mount price and riding skill a little bit.
:)
Hope this helps....and again, if you're on Blackhand, send me a tell and I can help you out a bit.