We have a couple of tutorials that will definitely help your parkour practice!
This first one will show you some methods for building precision jumping skills (super important when jumping at any kind of height off the ground!). And this second one will walk you through some primary tumbling skills, including all the progressions you need to get started.
Taking care of your body will be really important as well. This Body Maintenance Guide has links to routines covering many of the major areas you will be using, including the shoulders, wrists, hips, and ankles. Be sure to check those out too!