How to get started with windows phone SDK 8.1?

Question

Situation:
I am running windows 7 professional and I am trying to start developing windows phone 8.1 application.
I have downloaded :

Answer 1

Windows 8.1 is required to develop for Windows Phone 8.1

From the SDK download page:

For Windows Phone development:

• Windows Phone 8.0 development requires Windows 8.1 (x64) or higher
• Windows Phone 8.1 development requires Windows 8.1 (x86) or higher
• For the Windows Phone emulators, Windows 8.1 (x64) Professional
  edition or higher, and a processor that supports Client Hyper-V and
  Second Level Address Translation (SLAT)