Buy things to make money to get new things.
Start by clicking the picture of the lemon to run your lemonade stand. This will earn you money. Keep going until you can buy more lemonade stands. Eventually, you’ll get enough cash to buy a newspaper. Buy one, and repeat, now running both. as soon as you can, you should purchase the managers. They’ll run the businesses for you.
Eventually, you’ll hit a point where you’ll need to reset your game. This is in the “Investors” tab. When you click “reset”, you’ll get Angel Investors (or AI). These will help you to get MORE money, to buy MORE things.
Rinse and repeat, and soon you’ll be buying the moon. ;) Hope this helped!