1. no any char can be a hunter or any of the other jobs u can be
2. the lowest level u can use a pet is 10 and u are able to tame one at level 10 if u are a hunter that is. to tame a pet u get its health down low and use your "howl of tame" skill and it should kill it and the pet will be in your inventory.
3. u can buy the stones from other players stores at level 10 or u can kill stuff untill they drop them.
4. u get skills at level 10 from your job trainer and from there on up u can buy skill books.