Welcome to the forums.
Here are some of Eric’s video’s which i would encourage you to watch –
How to solve a cooling system over heat –
http://www.youtube.com/user/EricTheCarG … UzOTnsWImI
And how to bleed a cooling system –
http://www.youtube.com/user/EricTheCarG … UpXgAJ1gjU
For the suspected head gasket issue, i would recommend using a block tester and checking for combustion gasses in the coolant.
I would also pressure test the system to see if there is any external leaks.
Good luck and keep us posted.