Go to the library, pick out a few watercolor books and read them. Take notes on what you learn that might be useful. I've found that some authors recommend exactly the opposite things that others suggest. For example, one suggests sticking with about three colors while another says "you have 20 colors, use them all".
I've totally lost my enthusiasm for painting lately. But I have half a dozen books on the subject, so maybe it's time for me to read through them again.
