I received a grid with the pattern that has a lot of little squares on it that I think is what tells me when I should change a color within a row. However, based on this grid, I did not find anything in the instructions to tell me exactly how long each strip of fabric should be or if I need to cut little individual squares of fabric based on the number of squares between each color. And if cutting little individual squares is the answer, how do I know what size squares I should cut.
Everyone gave you lots of great advice. You are right, the grid tells you when to change colors within the row. It is a map of the entire quilt. For example, on my grid, the grid is labeled row #1, cut width of row 2 3/4". The first two squares on my grid are labeled 23 and 24, and that means to make a segment two fabrics long by removing the stitches between fabrics 23 and 22, and 24 and 1 from the fabric tube. For the same row, the next set of squares on my grid are labeled 1 through 24. That means to make the next fabric segment by removing the stitching on the tube between fabrics 1 and 24. Sew the two segments together between fabric 24 on the first segment and fabric 1 on the second segment. Continue down the row like that.
You absolutely do not have to cut out individual squares. I hope you can use the grid, it's much easier. I'm not really good at explaining, but I hope I haven't confused things. Have fun!