When creating a character, you must follow the template provided, which can be found here.
>>Click here for Template.<< Please fill out the template and DO NOT change it or use your own.
If you are wanting to join one of the main houses, which you can find here.
>> Click here for the main Houses <<. Then you must seek out of character approval from the head of that house. If you are unsure who the head of the house is, speak to a member of staff and they will inform you. Once you have spoken to the head of the house that you wish to join, you will come up with a way in which your character will be related to theirs and you can carry on with your file.
To become the head of a house, you must speak to a member of Staff and give reason as to why you think you should be allowed the position. Then, they will approve or deny you.
If the head of house position you want is taken, then unfortunately there is nothing we can do for you. However, we can suggest that you try join that house and take the position in one of two ways. One, become the heir and hope the current head dies. Two, become the heir and kill the head of house off.
For custom characters, you don't need to worry about asking anybody to join their house, because you are completely custom.
However, if you're a custom character with a desire to start your own house, then please read the Custom House Creation spoiler lower down.