ekam721 and hk_lkc both are right. For me, 初學油畫, you dont need 黑色 for paint :)
2 kind of red color, 2 kind of blue color, 2 kind of yellow color, 1 white color and maybe 1 brown color... the most important: you take your time to paint, and you can listen your favorite music to find some solution in your painting :)