• Obtain Microsoft Visual Studio 2010 through MSDNAA (you should have received email with instructions) or Microsoft Visual C# 2010 Express. 
• Install the latest NUnit release.
• Follow these steps to make NUnit compatible with VS.
• Install Git Extensions for access to Git repositories.

Linux/Mac OS X

• (Linux) Follow these instructions to install the latest versions of Mono and MonoDevelop.
• (Mac OS X) Download and install the latest beta/RC of the Mono framework and MonoDevelop.

References

• Using NUnit with Visual Studio
• Using NUnit with MonoDevelop
• Git introduction
• GitHub introduction