PowerPoint presentation redesign

- I am starting a business where I will be providing clients (who are private companies) with professional corporate advice about how to sell their business and how to maximise value and terms.
- I am UK based and I will be doing very similar things to these businesses: https://denningadvisory.com/ and https://www.alpha-advisory.co.uk/
- I have created a 10-15 page powerpoint presentation which I need making to look professional and well formatted and structured (slide master etc) with thoughts on palette, layout, design and pictures. I will want to use this presentation in .ppt format as a base going forward, that I will develop and edit further in the future.
- The document I have created has come from various sources, including Copilot AI and old presentations.
- In terms of colour schemes, there is flexibility, but it needs to work and link with the logo that I have (where the colour schemes are fixed and have been put in place).
- Also on one of the pages in the presentation, I also have an info-graphic that was created using AI, which means that the picture cannot be edited. I would also need this picture recreated, so I can edit it.
- Please advise what you can do and your cost.