The minimum and optimal is enough to keep them break even financially, nothing more. That could be $40k/yr or $90k/yr. Totally depends on their specific situation.
Whoever pays that salary should get equity in exchange, whether it's you or an outside investor. Ideally it's an outside investor (who can afford to lose it). Either way it should be at a reasonable valuation.
Whoever pays that salary should get equity in exchange, whether it's you or an outside investor. Ideally it's an outside investor (who can afford to lose it). Either way it should be at a reasonable valuation.