This is an important job for many companies and Alice has written a great blog on how to become one, make sure see it at:

Becoming a technical evangelist

That is how Alice Pang became a technical evangelist.  My road was completely different, as yours will be.

Many companies need people to explain how their technology works, and not have a sales metric.  Sales people are the respected soldiers of the corporate world, focused, with a good work ethic, but once the sales is made, the relationship changes.  With Evangelism, you don’t aren’t attached to commission, or a salary and commission.

What I like about evangelist is that I can build relationships and community.

You would have a different take on the situation!

Have fun!