When you're SLIGHTLY dehydrated your heart has to work harder to pump blood. Drink up!
It's super beneficial for you to stretch AFTER you run. Keeping your hamstrings (quads, gluts, and calves) stretched out will help with your future runs. Let's say this becomes a habit and one day you forget to stretch, you will most definitely feel a difference. Talk about being sore!
Having a good playlist, especially if you're just getting started, will help with those long distance runs. After a while try running without technology so that you can really feel the distance.
To help prevent possible injuries make sure to get fitted for a pair of running shoes. Although this might seem tedious and somewhat expensive learning about your shoes and your feet can be very beneficial.
Cross-training has always helped my performance as a runner. At the beginning of my last race I wasn't setting enough time aside to both run and cross-train. I could almost immediately tell how it was affecting my pace, breathing, and body tension.
All selections and opinions in this post are my own.