Welcome to quilting! I use Crayola Ultra Washable markers, from Wal-Mart, and stencils. It does mean I have to mark pretty much the whole quilt, which can be a pain of work, but at least I know everything is the same size and uniform. For an organic style quilting I don't mark on the quilt, just practice like billi-o on a whiteboard, until my muscle memory is good enough.