I agree with everything Ruby says, and would only add that 24/7 is perhaps the biggest responsibility for a Domme as well as a sub.
There is so much involved in any power exchange that the total unreversible aspects of becoming a 24/7 slave is a whole quantum leap beyond the type of relationship where a subblie may eventualy walk away from it.
Sometimes even the longest journey must begin with one step.
think about it carefully with your partner and see if it really is a journey you both wish to take.