New to the model: how to use it on a big question

I am new to the program. I am a business owner with another main partner. I am looking for an exit strategy in 19 months.

The aim is to sell my shares at my target price to the other main partner and two other potential new employee shareholders (willing purchasers subject to their personal financial constraints).

I have done my thought download this morning and felt drawn to start model practice with the result of “selling my shares at the target price at the end of 2021” . I realized it is a big and unwieldy result: I guess the answer is start smaller and break it into pieces.

Am I right? If so, how?

Thanks in advance