Needing Some Help

Alright, So I have a small team which is working on a UE4.10 project. Until this point we have been just working out of the epic games launcher and using blueprints not actual code. However we have some team members who live a good distance away and would like to contribute to the game. I have looked into GitHub and have an account. I have watched many tutorials on setting up the source. However I am running into some issues.

First, How do we build and send the updated blueprint project file to the repository?

Second, Can this be done from the epic games launcher Engine?

Third, Will all team members need to download GitHub and the files associated from the source?

Thank you very much!

Also Just happened to run into an issue with the GenerateProjectFiles.bat, will not recognize visual Studio 2015

Can anyone at least point me in the right direction? Thanks