- We do have a single money back guarantee (refund policy) in existence for every server we operate on. We do strive to deliver your purchased goods as soon as possible, but it may happen that we are AFK due to offline activities. You should not worry though - if the gold is not delivered to you within 24 hours, a 100% refund can be provided to you simply by sending an e-mail to firstname.lastname@example.org - we won't ask any questions to you.
A new quest will pop up once your first pet reaches level 3. It will send you to either Audrey Burnhep in Stormwind or Varzok in Orgrimmar. These trainers will offer a quest chain to battle specific Pet Tamer NPCs on each continent. Defeating each of these NPCs will reward a nice chunk of experience for your pets, as well a Sack of Pet Supplies (which has the chance to drop the Porcupette companion, among the always-useful pet bandages).
Only really to expand on Gráinne's comment as regards the 'collecting' and 'roster development' sections - which are, as said 'distinct' although they are intrinsically linked - I would like to point you in the direction of the in-game Achievements > Battle Pets > Collect tab. There are a series of achievements called Raiding With Leashes, pretty much all of which can be completed via the auction house - if you have the gold/inclination - or by completing old raids.