The best thing for you to do is learn some music theory and if you already know some great. WWHWWWH is a major "formula" and WHWWHWW is the minor "formula". Now start with say the A MAJOR scale.
A B C# D E F# G# A and minor A B C D E F G A. now when there is 2 whole steps (WW) the first note is a major chord. (i.e A-B=W, B-C#=W. so A is a major chord) If there is a (WH) then its minor(i.e B-C#=W, C#-D=H, so B is minor). Do this with all the scales, maybe write it on a sheet of paper and use it as reference.