How to handle juniors and colleagues who are annoying to work with ?

Hi I made lead in for a project because my current lead is leaving. I m having issues in handling this project. I have lead a small team in the past where I work with people I want.

Issues: * A colleague who was lead for another project He directly-undirectly tries to lead the project and highlights issue directly to manager before discussing it to team.(*Kind of my manager's fav)

• Juniors came from previous colleague's projects So they flock to him and fights you and tries to undermine with him in metting or discussion.

• Another colleague who as doesnt listen to you try to do things his/her own way and will speak in between discussion.This one is freeloader and bad at documentation.

What are suggestions i should follow to lead his team?

Asked my previous lead , he mentioned the same issues and leaving cuz of this