welcome to the addiction :thumbsup:

Multiboxing hunters is a good way to start.. you might want to look at changing one of the cats at a later stage for a Gorilla (better threat generation and holding of aggro, it all depends on how many mobs you are pulling at once) - and you can give him dash as well 8)

I currently have 5 at level 62 and they are a blast (even finished the Overlord quest in outlands without any problems). as for macros i just use hunters mark and pet attack on one macro, and either serpent sting, arcane shot or multishot as required, and then they just autoshoot the targets until dead (normally about 2-3 seconds for standard mobs)