This is something you'll need to create on your own since it's your own branding, it's the way you present yourself. Whether you choose to be creative, hip, classic, conservative or whatever.
Once you have decided how to present it (and believe me, it's the most important part), it will depend on the project, since not all projects are the same and only you know the client, the product, the budget and all other details.
About what to include, take a look to Guide Your Design With a 1-Page UX Strategy. Please note that I don't recommend to do this all in one page, but the elements the article mentions are pretty much spot on. To summarize, the article mentions:
- Circumstances of Use
- Design Criteria
- Success Metrics (take what the article says with a grain of salt, please!)
Or, if you want to be more "classic" (this is taken from a project we did for a very conservative company):
- Present Yourself
- Explain how will you help them (a simple 1 or 2 paragraphs explanation is more than enough)
- Explain what kind of results may they expect
- Explain what tools are you going to use. For example, you may consider a whole Design Thinking process and everything that it involves. Here you also add timelines and you may need to add some costs (for example, if you need to rent facilities for testing). See an example of things to consider right under the "Design Touchpoints" title
- Explain how much will this cost, and if possible, how much time will it take to recover the investment
Tip: Include as many visual examples as possible. Since you won't have examples for them, you should use from your previous work, from their competition or articles that are pertinent to the project.
As for visual presentation: again, it's your choice, but the least you must do is to "brand the presentation" and deliver in a non-editable PDF. Include a cover and an end page, think of this as a small book that will provide information as well as delight the user. They want and NEED to see you're all over the game