If you can pick a pattern, many of us can use different programs, tools or plain old math to figure out how much you need. Without knowing your skill level, preference for patterns, borders, colors, etc--it is too much guess work to figure out. Pictures of the actual fabrics would help, also. You could just cut it all in squares or strips, put them in a bag & start pulling them out and sewing them together until it reaches the size you want. That would be the easiest solution.
Most people figure out yardage needed based on the pattern they want to use. I play with colors and blocks to get the design I want & then start digging through my fabrics to see if I can pull it off or if I need to go shopping.