If you are not comfortable with using a color wheel, you could try the 3 in 1 Color Tool by Joen Wolfram. It is a great tool. You pick the color you like, and on that tab it show the tones and shades
(+ white and +black of a color) and on the back are color group suggestions that show the colors and where each grouping falls on the color wheel.
Product Description: Create eye-pleasing color combinations with this indispensable tool for quilting, crafts, home decor, knitting, sewing, scrapbooking, floral design, fine arts, and lots more! Based on the Ives color wheel, the 3-in-1 Color Tool helps you choose or match colors with complete accuracy. It fits easily into your purse or glove box, so don t leave home without it. PICK a favorite color or fabric MATCH the color to one of the 24 Color Cards and 100s of individual swatches, numbered for your convenience CHOOSE a color scheme from the 6 options provided for each color FIND the Color Card for each color in the color scheme SELECT fabrics or other colored items that match the Color Cards
If all else fails, look at the color way along the selvedge edge to see what colors were used to print the fabric. Match those.