This may be a great opportunity for you to earn some money while doing something you love to do.
Something I think you should think about is how much pressure it will put on you to make X amount of quilts in a certain period of time. Also increased use of your sewing machine may mean the need for repairs. Do you have a back up machine?
I recently finished a queen size quilt for a family member who paid for the pattern and fabrics. It cost me more than I expected as I needed a special ruler, I used more thread pieceing than I expected and also I had to buy special colored threads for the quilting, things I should have thought and added to the price she would pay for me to make the quilt. Since she was a close family member I was donating my time. Largest problem was the constant pressure I felt to sew perfectly, work faster and complete the quilt quickly. Vowed never to do a commission quilt again, it took all the fun out of quilting.