The following was posted here :
I agree with Frank. Riblett is a better first read than Theory of Wing Sections.
Better yet, why read? Computer programs are the way to go. You can
evaluate thousands of airfoils at full scale Reynolds numbers, and
they'll teach you stuff as you go. Here are a few to check out.
FREE, POWERFUL, VERSATILE, and ACCURATE:
INDUSTRIAL GRADE (X-FOIL) CALCULATION, WINDOWS INTERFACE:
ONE STOP SHOPPING FOR A STARTING POINT:
Airfoil Optimizer (but don't trust its database. Just start there.)
There are programs to avoid, too. If you drop me a line I'll let you know.