Host Provider (Bitbucket, GitLab, GitHub, others)
Source Tree
Git
Git LFS
Install Git
Install Git LFS: Install Git LFS in you local computer (See more)
Install Source Tree
Choose and create the Host Account (Bitbucket, GitLab, GitHub, others)
Create repository from the host
Download the repository in your computer
Setup the git flow in Source Tree
Setup Git Ignore: Create and configurate the file ".gitignore", you can use a copied file.
Setup LFS Tracking: Create and configurate the file ".gitattributes", you can use a copied file.
Create the Unity Project
Setup the Custom Packages: Optional step.
Upload the Unity Project to the repository
Setup the repository access: Share the repository to the team members.
Documentation: Create Project Setup Guide.