If you pick to play the Black Legion then you can build a strikeforce and that would be your clan. You will have a strike cruiser above planet to go to and that will be your base. This goes for any faction, legion, race, however they decide to do.
Welcome to the forums! if you are wondering something you can check the FAQ, there is also some pretty informative threads in the "resources and interviews" forum, so you can try there as well.
