I find that Sephora is a great place to start because of the vast amount of brands they have in store. You’ll want to get color matched in a few foundations (I’d do 3-4)!
Did you know that Sephora can make you a sample of any foundation they carry? Take advantage of it. You don’t have to buy anything at the moment (unless you really loved a product and need it).
Play around with your foundation samples (that are properly matched to you – yay!). Do they work well with your skin? Do you find that they match really well?
With these tools, you will enter in brands and shades that you wear that you know you are a foundation match, and then they will suggest matches in other brands and formulas!
Temptalia Foundation Matrix is a cool tool that does the same thing that Findation does, but you can also start from scratch if you have no idea what shades you wear in the first place.
For the Sephora Shade Finder, Go to any foundation product page, and you'll see a little button that says “Shade Finder.” Then you’ll enter in brands/shades you currently wear and it will tell you your match for that particular product.