It’s true, start saving for college as soon as possible. To help with your planning, here is a simple Excel model that I built and have been using for a few years that you might find useful.

The model allows you to plug in estimated costs, savings to date, projected savings and loans as to get to a zero balance. The example amounts are made up and I added comments to some cells to explain the logic.
To get the Excel doc, just click on the “Download” button from this GitHub repository:
https://github.com/robertjahn/docs/blob/main/college.xlsx
Good luck.