the dolls are roughly 8 cm tall. Since you need a small portion of each color (except maybe for the hair, which uses a bit more), this can be a scrap yarn project. I made both dolls with about 6 grams of that light blue color, to give you an idea. If you’d rather use full skeins to be safe, one per color will be plenty.
The pattern is a free ko-fi download for a 7 pages pdf. It doesn’t teach you how to crochet and the difficulty level is intermediate