Your best bet would be to take a look through the trade forums to see what things are generally going for. There's usually a few price guides floating around too for each realm.
Likewise, find out what items you might be interested in getting for your druid first (or check out some of the guides in the Druid forum) and then post a trade value request in the trade value forum to see how much they're worth. This'll let you know whether your Ist is capable of handling what you need.
Failing that, try posting this request in the trade value forums.