Make sure u dig footers by city code..think w ft deep and use good concrete
Here are instructions from Lowes on how to install a vinyl fence: https://www.lowes.com/projects/lawn-and-garden/install-vinyl-fencing/project
Here's an instructional video that may help, especially if you're using this same type vinyl.
Good https://www.google.com/search?q=how+to+install+a+vinyl+fence%3F&rlz=1C1CHZL_enUS709US709&oq=how+to+install+a+vinyl+fence%3F&aqs=chrome..69i57.7162j0j7&sourceid=chrome&ie=UTF-8#kpvalbx=1 luck and hope this helps.
Dig holes, place the posts, secure with concrete, then attach the panels. Sounds easy, but it actually takes a lot of labor and care. You need to be sure the holes are below frost level. The posts need to be spaced the exact right space apart for the panels. The posts also need to be held with support perfectly plumb until the concrete cures. We just had a vinyl fence installed, and I was glad to hire it done. :)