I like the idea of block and applique. You can make all the clothes and bibs into hearts and applique them on.
I think I would charge between $50- $100 since I am new to quilting too and I look at it this way. If I was not working on something, then I probably would be wasting time on the computer..LOL So I would not charge a lot until I was pretty good.
Are you going to be quilting it also? or just puting the top together. The price might change a bit if I was quilting it too.