My advice would be to pick something other than hunters at first. The pet system is getting a total rewrite for WotLK (both hunters and locks are changing), and learning to operate 4 or 5 toons at once is hard enough, adding 4 or 5 pets is going to make it harder (not to mention ammo, feeding and learning skills). Make a cheat sheet for making macros from the stickies and wiki. Try not to use accented letters in your first batch of character names (till you are used to typing toon names over and over). Finally, learn to ignore spitting and comments.