Lol you should see my face. After lvl 15 there's only one questline?

And the thing about levelling different classes on the same character. Does thst mean I can have a lvl 50 Gladiator, but if I give him a bow he turns into a lvl 1 archer?

How are we supposed to do it? Do a bot of conjuring, then switch to pugilist for a level or two, then switch to the pet class, etc?