-should i stretch before or after running? Both. If you dont stretch before, you could pull something, and if you dont after your muscles could tighten and cause pulling as well.
-what about hydration? when should i drink water? From what i know, you shouldnt chug it while you are running because it could cause cramping. I always bring water when i run because i do get thristy, but i sip it. After i am done i drink all the water i want.
-and eating, what should i eat and when? i don't usually do breakfast, and i will be running in the mornings. You should eat something before, whether it be a piece of fruit or an energy bar or yogurt. It helps your metabolism and gives you more energy. The same applies for AFTER running. Dont pig out!
-also, where do you keep your keys? my shorts don't have pockets, so i just put them in my shoe. Shoes are an excellent idea