Hi Michael,
Worth mentioning that you can review the official MongoDB .Net driver source code: mongo-csharp-driver. I have especially found the tests and examples in the repo useful. See also the examples section in the driver reference.
You may also be interested to enrol in a free online course at MongoDB University.
There is a session for working with MongoDB C# Driver - M101N: MongoDB for .NET Developers to build a blogging platform. The next round session starts on the 24th May.
Regards,
Wan.