Ok I think you are just setting up an waterring system with hoses.
If you are I know what to tell you.
What you do not want to do is run the entire system at one time.
This depends on how large the system is though.
If you have more than 50 ft of water lines you need to break it into
two parts. this is so that you do not overwelm your well and that you
get the best watering your plants need.
when it comes to setting the timer you don't want it to run in the
hottest time of the day.
Sometime in the morning or early evening is good.
Hope this helps
Chuckie in the blooming North, zone 5