Your first 5k
To run a 5k go out and run right now. Ok how far did you go? Make it easy count blocks, for a very rough estimate just run 20 city blocks and back. Do what you can every day until you reach this goal. All city blocks are different but 20 is about half. Just keep gradually increasing until you can run run 20 blocks and back. If you want to be exact go http://www.usatf.org/routes/map/ and just trace your running route and it will give you exact distance. Put in your zip code for your city map. All you need to do run every day and increase gradually as you can. The important thing is start and increase gradually until you reach your goal.