Licensing Concerning.

I'm planing on purchasing the licencing for my organization but I still have doubt about the license.

Can someone help me on the following question.
1. Will the device that I "remote to" also need a license?
2. How many remote session can I use in each license?
3. How many devices can I sign in each license?
4. Can a free license remote to my licensed device?

The more you silent, the more you hear!