You can download Go from http://golang.org/
You will need to install MongoDB. You will find it at https://www.mongodb.com/. You will also need to create the path C:\data\db (Windows) or /data/db (other).
First of all, you will need to install Bazaar, which you can get at http://wiki.bazaar.canonical.com/Download. Next you will have to add the path to bzr.exe (or bzr) to your search path. The last step is to issue the command
go get labix.org/v2/mgo
Add your Git's path to the GOPATH enviroment variable. Then, to build the web server, enter:
go build gomgoweb2.go
You might need more parameters if you're using Linux. To start the server, simply execute the "gomgoweb2" command.