pretty hard to estimate with the givens. I would think you would want 1/4yd @color for Dresden plates, you need a center color also. Sampler-you will need a lot more than 2 colors & cream to make interesting blocks. Irish chain-that is 4 1/2 yd for the top. seems low as there are so many seams in it.
you would be better to take more time to figure or just get the scattered colors for the plates & work on the rest later. haste makes waste. unless you can just buy yards of each color you like ! good luck! & welcome back to quilting !