Welcome to TalkBass DB, Issak! It's always good to see younger folks getting into double bass. Here's some good reading:
http://www.gollihur.com/. Bob has a lot of information on his site, including a great luthier list.
If you've read all the threads that Uncletoad linked for you, you've learned to stay away from the cheap eBay basses and to be wary of Cremonas, Palatinos, or other cheap, Chinese basses (CCBs). The deals look good, but there are a ton of horror stories. If you can come up with $1,500 you'll have a reasonable choice of serviceable instruments. You can find something for less if you shop around carefully.