It's very difficult to get networks or producers to look at an original TV series proposal unless you already have a track record in TV, but occasionally there are contests for new series proposals, called "bibles."
If you're interested, this article at nofilmschool.com is the best model I've found and it includes a template you can use. Good luck!
https://nofilmschool.com/how-write-tv-show-bible-free-template
Good luck!
