Hello and welcome.
You are correct we have the ranger and wizard as the only played PCs at the moment. And although I hope to get back some players I must plan for the worst.
You can create your own PC to be added into the campaign. I guess a defender or striker will be needed. Also everyone will be lvl 2 soon (don't tell them that though) so your character can start at lvl 2.
Sources are kind of complicated, if you can just use PHB-1 for races I'm soon going to allow the PHB-2 and the Adventurer's Vault for lvl 2.
HM