DrJoe wrote:

2. How does an owner go about establishing a revenue stream from
potential purchasers of air time.

You have the same options that the other SW broadcasters in the US have,
namely questionable religion and right wing paranoids willing to buy time.
I suggest checking out WWCR as an example.

3. Who would the primary customer base be?

Probably people who respond to either of the two formats above, but if I had
to bet about programming in Spanish, I'ld bet on evangelicals targeting
that market most of all.