One of the things I really like about Dragon Age as a system is that there aren't really a lot of expectations for how the game is going to run, which means that the GM and the players get to decide how they want the game to feel.
It gives you a lot of freedom in how your campaign is structured, but I admit that does not give a new GM much to work on. I'd advise trying out a few magic items and if you feel that the PCs are becoming stronger than you expected, you can always pinch the treasure hose until they start getting to tougher stuff.
As shonuff said, magic ammunition, potions, poison doses, and bombs can make excellent finds early on. You can have the PCs pick up a nice weapon or suit of armor when they finish a story arc or defeat a particularly nasty foe.
I'd also recommend making some masterwork items available for sale, like a nice set of daggers or hammers at a master smith's shop, but make them just expensive enough that they are out of the PC's reach. This means that the money the PCs start finding can be put towards a goal of getting the gear when they come back to town.
I usually make a weapon that is a +1 to hit or damage about 5 times its original price. Masterwork armor, with a +1 to AR, is also 5 times the original price. If they want higher, it climbs very fast, with +2 total bonuses being worth 10 times the original price, and +3 totals being 25 times the original price.
You can also let the PCs know that if they invest a lot of money into tools or clothing, they could get bonuses to the tests they use those items for. I use the same multipliers as above. For example, a masterwork set of lockpicks that gives a +1 bonus to Dexterity (Lockpicking) would cost five times the original price (12 sp * 5 = 60 sp). For lower level characters that is a bit more to part with, but it can be gathered quickly if the PCs really want it.
This is, of course, how I run my games. If you decide this doesn't fit the tone of the campaign you want to run with you should feel free to experiment! It's easier to fix giving too little treasure than too much!