Welcome to LW! Damocles is right that only the first chapter is out, BUT there is a chapter for each pack. So be sure to check out all four of the campaign stories. ^^ The story suggests that you may be switching packs to join, but that is just flavor -- you will stay in the pack you initially chose upon registration.
Hi hi, welcome to LW! I hope you enjoy your time here. Don't hesitate to ask if you're curious or need help with anything, the community here is very helpful ^^
Welcome to lw! You can get more wolves through breeding (accessible on each wolf's profile), finding wild wolves (randomly in the campaign they show up, and have a rare chance to join your pack. If they don't, you get a knucklebone. 50 knucklebones can be exchanged for a wild wolf in the hunting profession. Wild wolves are randomly generated, so you never know what you'll get!), or buying from other players via the flea market and forums. There are also some free wolf threads in the forum!
Unrelated, but I run a free food thread, so feel free to message me or comment on that thread if you run out of food while campaigning! :)