If there are any frequented class 1-2 runs, hang out at the take out on a busy day and try to find some people willing to let you join. Chances are they are beginners or taking beginners and won't mind you coming along.
If you can figure out how to roll in a local flat water spot (pool, lake, pond, etc.) that would be very helpful for both learning and joining with people. If they don't have to deal with you swimming they won't mind you tagging along either. And even if you do swim, they can help you perfect your roll on the river, in eddies, etc. But having some skills is more encouraging to you and others you join up with than having none and them having to show you everything.
Watch a lot of youtube videos about techniques and how to roll and things, and then practice them in flat water as well.