More congratulations for acing those midterms – that's wonderful 

If he's happy with doing what the lovely brwneyedgrl suggested: doing every single bit of housework, supper, and keeping himself ready for sex at a moment's notice, plus anything else you can think of just go for it!!! You may as well take advantage of your genius results. Maybe he won't be very happy with doing that though, if not here's my suggestion:

As he is your Master I'm assuming that you know his mind well enough, but if you've only ever seen his Dom side and never any subbie side I would recommend a long chat about why he wants you to take control, his limits, etc. - in fact you can "order" him to tell you everything you need to know before accepting his further submission (hmm … that would be a good exercise for a Dom … thinks of doing that myself as a self-improvement task).

Of course it depends on the length of time of the reverse-role agreement, but my thought as a "quick fix" is to get him to list a number of things (maybe start with 5) he's prepared to do as your sub, then choose the one that appeals to you most. If there isn’t one that particularly appeals get him to write another list etc. until you find one – and of course you have to communicate with him what you are actually going to do (to interpret what he said) in the same way that he communicates with you when he gives you a task.

If he fails, his punishment could be to do all the things brwneyedgrl suggested anyway! Heehee.

VV