if you create a multplayer game you can make your onw charachter rigth ?
but do you get the arnise hold and the sfere if you took a mage and a knight and a thieve and a bard ? do you get all the castle ( meaning thieves guild , theater , de arnise hold ) ?

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am a surfer i like it to ...

Only the protagonist (the character you create first) can have a stronghold. So you can only have one.

If youre playing on-line, the host is the protaganoist

Is there anyway to create your party and play without getting online?

of course. you can play offline with a multiplayer party but still you can have only 1 keep. But you can change your class with shadow keeper.

My advice: Play the multiplayer option with npcs. and during some quests let your friends join you an play online its very exciting.