Unless you're trying to create a twink, there's really no benefit in investing a large amount of time trying to acquire a specific piece of gear before you hit level 70. Even an epic will usually be replaced with something better in 5-8 levels tops. Run with the best you can come up with without knocking yourself out over it, and carry on.
A good option is to do a few PVP matches and get the Outrider's bow (horde) or Outrunner's Bow (alliance). Easy to get, good DPS, and will last you a while. Plus, they can be upgraded every 10 levels until you get to Outlands!
Just a big problem though, theres alot more twinks on alliance than horde(atleast on my battle group) so they end up GY camping us for most of the time.