Market Sizing for Investor Pitch Deck

We are assisting a start-up with creating a pitch deck to secure funding with investors. As part of this, we need to prepare marketing sizing and financial estimates, projecting out several years. It's a new venture, so there is not a lot of existing available information. This will require helping create a model and making certain assumptions that we can then include in the deck. We need someone who can help think through and create the model, and potentially attend a couple of conference calls with the client.