Whether you wish to Lead or be a member of a House it is important to note a few things.
Are there already people in the house? If yes, it is wise to speak with them (ooc) and get a feel of what roles they are wanting and needing. Get a feel for their concept or ideas of how the House is being run and what their expectations are.
You may learn through conversation and some RP interaction that they may not be the House for you - or you may all click and feel you have come home at long last.
Noble House Leads will be asked to sit on the Small Council.