- anything about the languages you are picking from.
- the pros and cons of using each of those languages.
- what will be required of the project.
- the libraries/resources you will be required to interface with.
- how the languages relate to other languages that are known by the developers of the project. (If any of the languages will be new.)
If you've built Windows Phone or Windows Store apps you can cross-promote them with AdDuplex to get more users.