Hi. It appears from the code you provided that you have not defined the Todos collection on the server (you need to define collections on both the client and the server).
You might want to go through the tutorial to get some clarification on how to set up collections and perhaps structure your files differently.
Yes, in the second video it shows that meteor version 1.1.0.2 was installed. The current version is 1.4.1. For a more up-to-date version of the tutorial you can look here. Additionally, I can recommend the meteor guide.
You should keep your collection definitions within a directory called lib. You want your collection definitions to be available on both the client, and the server. As others have said, if you read the meteor guide it explains virtually everything.