Install the latest MongoDB Community Server.
Verify you can run mongod and mongo from your command prompt or terminal
(If you can't, Google "configure path variable" for your platform. You need to add the mongo\bin directory to your path.)
Decide where you want your data directory to live. Assuming you are on a lab PC, let's say your StarID is ab1234cd so you'd like it to be at C:\Users\ab1234cd\data\db.
You'll need to create that data\db directory.