Tips on changing my eating habits?

Ok, so I'm the typical student who eats mostly frozen meals and other highly processed foods. I absolutely hate cooking.

For health reasons, I need to change my diet to healthier foods. I'm not planning on making this lifestyle change over night, I'm going to start off cooking one meal a week. This is slightly less intimidating than going all out, to begin with.

Do you have any tips or advice you would be willing to share with me? Also, do you have any quick, easy, and cheap recipes you could post here?