Excel Spreadsheet Business Plan

Need to put together basic business plan for the next year using data from last 12 months to calculate projections and goals for 2019. So I am requesting a Excel Spreadsheet that I can enter data from 2018 on a monthly basis and use trends and calculations to lay out in a separate column our goals and projections for 2019 and beyond. Here are the different data points that will need to be on it....

Total # Cars in Market
Total # Cars Sold
Total Front End Profit $$
Total Back End Profit $$ (separate breakdown for Back End Profit with totals to this cell)
Finance Reserve $$
Extended Warranty $$
GAP Ins $$
Auto Armor $$

I will also need a separate excel file with a more detailed breakdown of our finance dept to track a monthly profit breakdown on a per unit sold basis using the same fields.