Best thing you can do right now is visit Facebook and type in your city parkour. For example, if you lived in Houston you would type "Houston Parkour". Find a community to join and start training with, it is invaluable. Parkour is one of the best things you can start doing for your body. Start basic training such as rolls, vaults and landing.
Here is a post I made yesterday, i really hope it helps. If you have any questions just ask away!
To start off you need to understand the basics of landing and rolling. These are the foundations for everything else you will do in parkour.
Rolls:
https://www.youtube.com/watch?v=RgPd29MlHpg https://youtu.be/6x-cG9giKXYhttps://youtu.be/B9Jdx1cHKHUWhen you start to learn rolls you need to start on a soft surface such as grass or a mat until you get the basic form and shape of the movement down. Eventually, you'll be able to move to harder surfaces. You should always roll if you are jumping off something higher than yourself.
Landing:
https://youtu.be/EJb-pkmv-7Yhttps://youtu.be/ZhJ90doKqRsYou should always land with proper form. This means landing on the balls of your feet (where the toes connect to the foot) and palm slapping the surface. To start off just jump in place and land correctly. You want to look just like the people in the video.
After you get landing and rolling memorized you should move on to vaults. I will link the safety vault to start you off with.
Safety Vault:
https://youtu.be/OZFnbIOmmIYhttps://youtu.be/CStyLm_auPcThere are a number of other vaults for you to try also
Speed Vault:
https://youtu.be/gCoY76Mb9mIKong Vault:
https://youtu.be/SzrhtoVIrRYDash Vault:
https://www.youtube.com/watch?v=rMlyD1thViEReverse Vault:
https://www.youtube.com/watch?v=-WCYMvcMDnAThere are many other vaults but these are the basics!
Lastly, we have wallruns, they are simple enough but require lots of training to perfect.
Wallruns:
https://www.youtube.com/watch?v=QHXkoKph330https://www.youtube.com/watch?v=iZo1t0c__eUTic Tac uses some similar techniques to wallruns
Tic Tac:
https://www.youtube.com/watch?v=8VnGI31lp0w