Well, first of all I can recommend reading the
manual, and visiting the
IRC to ask anyone present any questions (or here for that matter.
As a starting player you will want to accept someone's knight offer or join a realm where you know you will be well received. Being King of Ascalon, I can tell you that in Ascalon there's definitely stuff that needs to be done. If your character has already spawned, see if you can talk to the local lords (also, where are you?

) for troops or lands in exchange for your oath of fealty.