When I first started wearing foundation, my mom took me to Macy's and had the people at the Lancome counter match my color and bought me foundation. Then when I ran out of that, I took the empty bottle with me to the drugstore and used it to help me pick out an appropriate shade since there was still product on the side and stuff. Maybe you can get a sample of foundation instead of a full bottle from someplace similar. Doesn't have to be Lancome specifically but it really did help me figure out what color was best.
Color matching at the drugstore is the worst.
What's this for? It's a wig.
What's it for? To disguise yourself from yourself.