The main issue for most of these types of relationships is you don't really have any idea of the subs real life commitments and responsibilities. Often they will be very keen and willing but real life intrudes all the time making sticking to rules, performing tasks etc difficult or impossible. Now you can try to stick to your guns and enforce your will but often this will simply result in the sub dropping contact altogether.
The bottom line is don't expect too much too soon and if your sub is not complying find out why, is it because they don't want to do what you ask or simply that they can't.
If it's because they don't want to is this because your tasks are too extreme, too boring or not challenging enough or are they just being wilful to test you?
Also remember they won't always be "in the mood" not everyone is horny 24/7 and time zone differences exaggerate this effect.
Be patient and communicate, if you work out what works and what doesn't you can both enjoy yourselves!