So, my band teacher was teaching me minor scales, such as pure minor, harmonic, and melodic. Well, I never really got melodic minor scales, I know its one way going up, and then different on the way down, but I never really figured out how to convert it, any tips? It might help if you put a scale, like the G scale. G A B C D E F# G, like that, and I can figure out the pattern if you name the major scale.
Melodic Minor:
Ascends with 1, M2, m3, p4, p5, M6, M7, Oct.
Descends: Oct, m7, m6, p5, p4, m3, M2, tonic.

So basically, you ascend Harmonic Minor with a raised sixth. And descend in Natural Minor.
So you know the natural minor, that's step one.

So raise the 6th and 7th going up. (Basically, now it's a major scale with the 3rd flatted.) Then play the natural minor going down so it's

1 2 b3 4 5 6 7 8 b7 b6 5 4 b3 2 1

In G minor, it would be:

G A Bb C D E F# G F Eb D C Bb A G (Notice the F coming down is natural.)
I know you're not asking this as a question but I think you can get along fine with just the natural minor scale if you don't want to use the melodic one.