My dear friend Sharm who is a musical contributor to this project recommended that I offer my voice. My voice is very deep, pronounced and enunciated. I am also 41 years old so my voice has a "mature" sound as well.
How exactly would I go about submitting my samples to the project leads for consideration?

If you have a deep British voice, definitely try out for Altmer! Think Benedict Cumberbatch from Sherlock - cultured, arrogant, intelligent. In the voice acting subforum are audition threads for each of the races. Altmer (high elf) is one of them.