4) When will dividends start, and how frequently will they occur?
When the cash-flow becomes positive.
So what? Cash flows are not positive? yet?

Who knows, but not being positive or not profiting doesn't mean that the company is failing.
He might be still reinvesting it to position himself better in the market, still financing its growth from operations.
Killing the competition is priority, the end game is not profiting now, but owning the market tomorrow.
Once you have a dominant position, you can take a break and reel in your profits.