Create Breakeven Analysis / Revenue Projection Spreadsheet from Data

I'm starting a new eBay business and need assistance in analyzing the up front costs to start it, ongoing costs, and projected sales. It should be a simple project that will take approximately 3 to 4 hours, possibly more depending on level of detail in the finances and your efficiency. You'll be analyzing the following: 1) eBay Store cost difference between premium store and anchor store ([login to view URL]) based on projected number of fixed price monthly listings. No auctions will exist, only fixed price. 2) eBay final value fees dependent on store type (premium vs anchor) 3) Paypal fees 4) Sales tax 5) Fixed costs such as LLC, Amazon Prime membership 6) Revenues earned based on a 10% margin 7) Fees for using automation software 8) Simple tax formula to predict estimated tax payments