I think that you're right about not making too many resolutions. The more you make, the more likely you are to not keep one (or any of them).
Good for you for wanting to be more physically active!
Listing can be a wonderful thing. I write a list of things I need to do the next day as I'm relaxing in the evening, then pin it to the fridge. I find that I get more stuff done and am altogether more organized if I list things.