If you go the subscription route, rather than billing by the hour as brudgers suggests, then make it VERY CLEAR what your subscription service includes. Anythin

If you go the subscription route, rather than billing by the hour as brudgers suggests, then make it VERY CLEAR what your subscription service includes. Anything past that, they need to pay up. When in doubt, spell it out, because if you don't, it's likely people will expect more of you than you're offering.