Beginning collage

It's a cold, rainy, winter, Sunday afternoon. I've been wanting to try my hand at collage painting, so there's no time to start like the present. A friend suggested I cut out colored paper and objects, glue them to a hard-back surface, enlarge them to full-size watercolor sheets, and paint them. I've been wanting to break out of my box, so this sounds like it could be a start. It's intimidating--all the colored pages, all the pictures--my right brain hasn't clicked in yet. It's still trying to figure out what might work. But at least it's a move in a different direction. I understand that sometimes it takes H.C. Dodd a couple of weeks to work up a mock-up, so I still have time. Patience, Sheila!