So i'm wondering how i should go about it, should i try to get pets and fame first or should i start maxing even without pet?
Read realmboxer's guide you can find it from kronkboxer it tells you pretty much everything you need to know.
I just bought the Play More Package on all my multibox (10 accounts) for 2 backpacks, 1 chars slots and 1 vault
When you start your accounts up you start on wizard get paladin unlocked on each and everyone of them, but as you do so get 224 fame on each of the classes then suicide them. At the end this will give you around 2400 fame and you will have enough for uncommon pets if you feed 250+ fp items, then make whatever combination of classes you want and start your mboxing career.