Watch the Two Five One Minor online guitar lesson by TrueFire from Play Jazz Guitar 3: Tools & Techniques
Now that you have a good grasp of the the ii, V, I chord progression, and have even played some variations, it's time to look at it's minor counterpart. With most things in music there will be a Major version and a minor version. The good thing is that some of the principles work for both, but you just have to adjust your thinking about what chord goes where. Start with this version and see if you can't get a feel for how these chords are supposed to sound in this progression.