Welcome to the game, Luner!
Simply log in, click on the topic titled "Travelling within North Castle", and enter the Town Square. From there, head to the Traveller's Hostel. There create your character's story, profile, etc. To make a link to it, just do as SL13 says in the topic "Welcome" above, in the New members Forum, which is here. And just let me know if you don't know what a URL number is.
Now, in case you didn't know, just move around in Hyrule using the compass at the top of the forums. You must trek East to exit the Castle. Use the World map for help.
And also, you are quite a Cleric yet. Good class, though. Marin will be proud.

Anyway, you're just a Scholar for now. In order to get your base class, simply gain TPs (Talent Points) By helping None Playable Characters (refered to as NPCs), who have the word "Quest" at the top. Like this...
Narrator wrote:Quest: A Caravaneer's Quandary
<img src="images/npcs/goronmerchant1.gif" align="right">A Goron Merchant looks amiss as he sits in the middle of the Town Square, muttering quitely to himself, "Ohhh... the Boss is gonna kill me..."
Seeing you walk up to him, he perks up a bit. "Hey!" he exclaims, "you look like one of those new able-bodied adventurrrerrrs flocking to Norrrth Castle. I need a favorrr... the axle on my wagon brrroke, and now my carrravan is stopped. To get it rrrepairrred I need some Superrr Strrrong Deku Wood from the Thicket east of herrre.
"If you can get me some, I'll make you an honorrrarrry memberrr of the Gorrro-Gorrro Carrrtel and give you access to the Carrravans Quarrrterrr, which offerrrs quick trrransporrrt to both Rrraurrru and Rrruto Town! Plus we have a Bomb Shop! How can you rrresist?"
OK? You need to just gain enough TPs to buy Cleric-only abilities. You can find abilities, spells, weapon training, songs, and languages from the middle of the Rules Set and Down. OK? See you around. And enjoy the game.

Oh and good luck!
-Nogare