So a dwarven ranger and a tiefling warlock, would be fine. Or a Changling
rogue and a Human Artificer would be two half normal characters the only
reason I want some normal is that the strange characters may have a harder time
in the campaign. If you were all Rat people no one would talk to you and the
campaign would end immediately. Some some mix of strange and not strange is what
I hope for. Don't worry, I will get you all together in a group, no matter what
your origins.
If I were to advise one to buy one book it would be Pathfinder Roleplaying
Game Core Rulebook, since it is the most recent version of DnD we will be using.
It would be best to have in the hardback, real version since it is essentially
a players handbook and DMs guide put together. It has all the standard rules,
feats, spells, etc for the DnD game. Otoh, the pdfs are available on the internet
in torrents, so start with the pdf and when you want to buy a real book, get the
Pathfinder Roleplaying Game Core Rulebook...
BTW, here's my rant: Pathfinder is the company that broke away from Wizards of the Coast when they decided to screw over all their old players and make a new edition 4.0 and fire half their staff who made both Dungeon and Dragon Magazines. Wizards made 4.0 which is a really dumbed down version of Dnd, and Pathfinder evolved 3.5 edition into 3.75