When rolling a hunter, your first choice to make is which race to choose? First you need to decide what your priorities are. Do you want to raid? PvP? Mostly just quest and do solo content?
Unless you are looking to really min/max your DPS, you can be successful with any race, but there are a couple of races for each faction that make the most sense for a hunter.
This guide lists the races in order of best to worst as far as racials go.