How to export a file as a specific wave format

Audacity version 2.0.3
Windows 7
I believe i obtained the .exe installer

I need to save a file as an 11.025-99.000 kHz 16-bit mono.

I am fairly new to this product.

What does that mean?

Do you mean that the sample rate must be between 11.025 kHz and 99 kHz?
The default sample rate in Audacity is 44.1 kHz (44100 Hz).
The actual sample rate of exported tracks is determined by the “Project Rate”. That is set in the text box in the lower left corner of the main Audacity window.

The default “WAV” export is “signed 16 bit”.

If the audio in the Audacity project is all mono, then the exported file will be mono.
If the audio in the project includes any stereo tracks, or mono tracks that have been panned left or right, then the exported file will be stereo.

To convert a stereo track to mono, see: Audacity Manual