Aku, do a baseline
Find out first where you are, then start drawing lines in the sand in terms of where you want to be in 1 month, 6 months, 1 year, etc
There are some good threads here where people just post how many push-ups/pull-ups they can do in a single try and how many they can do in a minute, etc
Once you've figured that out, then train for your goals. If you can do 2 pull-ups, and you want to be able to do more, well, train pull-ups.
I'm going to help you be more specific on your goals. Since you can practice parkour right now, you basically want to improve your physical condition so you can...?
I'm sure there are other non-parkour related goals you might have that parkour can benefit from. For instance, I want to be able to bench press my body-weight 10 times. Things like that