Start with 3 colors. Each block is 9 stitches so for however wide you want the blanket, count in 9 to get your foundation (always make it an uneven number of "blocks) eg: 19 blocks(makes it about long) stitches then add 4 sc for the foundation row.
I will try this pattern Crochet by Ellej
flor camelia passo a passo
Flor coração passo a passo - croche.com (37)
Como No Tempo da Vovó: BOLSA PRÁTICA EM CROCHÊ COM GRÁFICOS