Love your ideas, you have an empty space in the star that is a bit to empty. The biggest thing about quilting a quilt is to keep the denseness (is that a word?) even.
You could echo the star inside, that way it would be the same density.
About quilting for others, my business plan was to do enough of my own quilts, showing them to guilds and the quilt shops. Taking classes and when show and tell was available I could show my work. Have some nice cards made up, and be sure to make your business legal, it doesn't take much to get a tax id, and then you don't have any "guilt" for doing it under the table.
Be sure to have insurance, you never want anything to happen without insurance.