It appears that i was not very clear in character creations. When distributing your skill points, if you choose to use a kekkei genkai, it deducts from your skill points. So if you want to use a sharingan, you can only use 11 skill points
Also, you must have a reason for the kekkei genkai. A non uchiha cannot use sharingan without some reason. Any character can have an elemental release however.