I’ve written about financial modeling for startups on here a few times, and included a few sample models. More recently, I led an after-work class internal at Neo for those interested in improving their skills.
For those into lean, doing a thoughtful financial model from scratch is one of the best ways to spot hidden but critical assumptions, risks and dependencies.
To be effective, it really helps to know some key techniques within Excel, both in terms of formulas but also in terms of modeling best practices.
In case it is helpful, I just put the Excel workbook I created as a teaching / exercise tool for the class up on S3 for anyone to download.