I just started playing again and rolled a hunter now lvl 32, never played one so I wanted to try it out. One good tip that I forgot to do was to glyph my spell book. At 30 you can have 2 majors and a minor. I put in Serpent sting (adds 6 secs additional), Arcane shot (refunds 20% mana on your shot if you have a sting on the target) and the minor glyph of mend pet which is nice cuz i dont have to worry about feeding my pet any more. These 3 glyphs help a lot at this low level