1. I still havent figured out how to make a profit with donuts, I just go completely broke and have to reload an old save
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You can unlock Dizzy's without actually opening it and therefore without incurring any of the costs of running it. Just keep working like normal and spend any extra money you have on the promo campaigns till you have somewhere close to 150 Notoriety, then just hire one person and you should either be turning a profit or running at a very easily outworked negative. Keep raising notoriety (the internet campaign is the most efficient) until you can afford another worker until you can have 3 working all the time, with more notoriety expanding your profit margins.
There's also the secret facility, which will help you boost notoriety for the tasks you complete there.