Cash flow statement and assumptions

Finish this part Cash flow statement and assumptions.

Our company is Carsales, and we got two ideas:

A. We rent a warehouse which is enough for displaying the owners who want to sell their cars, and we get the rent fees from the owners, like half year or one year, and when the cars sold. The company will have the bonus from the owners.
B. We learn from the Airbnb, and the owners can put the advertisement in our website and we can get the bonus while the cars displayed in our website got hired.

Work out two ideas COGS and predict their profits. Need some data in this requirement, thanks

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