Once you have your paints, one of the things I found the most useful and helped me get to grips with making whole ranges of colors was doing my own color wheel.
-it is really different from just looking at one in a book.    You'll learn so much!!

"Do yourself a favor and do your own.."

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1. Primary colors

• Add your 6 primary colors, warm and cool as above
  

In the 2 slots in between each group..

• Add a mix of Reds and Yellows, warm with warm, cool with cool
• Add a mix of Reds and Blues, warm with warm, cool with cool
• Add a mix of Blues and Yellows, warm with warm, cool with cool
  
  
  
  

3. Adding Tints

• Add White to each color to give its Tint

To make a shade of a color (darker), rather than adding Black paint you can add a little bit of it's opposite color on the color wheel.
This creates lots of other colors. Yellows become Yellow Ochres, Greens become Raw Umbers and Burnt Siennas..

• Add a tiny bit of the opposite color to your main color