I am a Masters' student and I have been working with a Professor and one of his students for about three months now, and just recently I asked him about a possibility of funding me. He said he would be able to do it, but expects me to submit a proposal for the semester with other expectations, that I would discuss when I meet with him. He also added that the expectations would be slightly different now that he's ready to fund me. That certainly makes sense. But I can imagine on some days, particularly when I have my coursework exams I cannot contribute much to the Research work, and I'm not sure if I'd meet his expectations then. Should I explicitly talk to him about this or is it understood? Also, the pay will be on an hourly basis and is it a good idea to:
negotiate pay per hour / number of hours per week if it's less than my expectation, say 17-20 hours; ( I used to work (unpaid) on an average for about 25 hours a week, but university restricts only up to 20 hours)
ask him what he'd essentially do during those weeks of exams etc?