How to make /team related datapack

I wanted to make a datapack with custom commands to run commands from vannila "/team" feature:
So basically, the team command itself only available for server operators (not normal players). I want to change it by making custom commands to workaround (that can be run by the normal players).
I also wants to make the people who made the team has a special "tags" or role to make them "team leader"
For example:
/t create [teamname] // acts like /team create  (leader only)
/t join [team] // like /team join
/t disband // acts like /team delete
I am new to the datapack, any help is appreciated!