Hi Sandy
For a simple guesstimate, check the quilt kits at Connecting Threads. You can search their site with keywords such as ‘baby quilt kit,’ ‘queen quilt kit,’ etc. You’ll get an idea of size, yardage requirements, and pattern prices (if you need one). The info they provide is very straight forward, and you will also see how much backing fabric and batting you will need. Add binding (½ yd?), needles, thread, marking whatever, rotary blade and stencil. Tougher to figure, but a real expense is electricity and use and wear of your equipment. Now for the totally impossible to figure out is time - I am slow and cranky when under pressure so there is no middle ground for me - either a trip to Provence or I agree to work for 50 cents/hr - kind of forces me into lifetime amateur status. Good Luck with this - it is certainly doable - but expect a learning curve on the business side of quilting.
Lefty in Philly