Business Case Analysis and PPT

I have a sample business case I’m looking to have analyzed, a professional PowerPoint and Excel calculations done for, then have someone walk me through how they did it if I have questions. I’m trying to learn how to do it and have templates to work with for a software comparison with the full financial analysis, strategy map, capability model, gap analysis, implementation roadmap with the relevant info in the PowerPoint but the information available in the spreadsheets.