I know this question is kind of old, but when I was first starting out I was lucky enough to find this book: https://www.amazon.com/Presentation-Secrets-Steve-Jobs-Insanely/dp/0071636080/ref=sr_1_1?s=books&ie=UTF8&qid=1488490568&sr=1-1&keywords=presentation+secrets+of+steve+jobs

(is not a referral link)
I really really think that this book helped me close many deals. It walks through creating the slides and the thinking behind each suggestion. Very easy to follow as well. Now for all our startup clients who need mvp developed for them we of course build their needed software but also include this book as part of our onboarding initiative with them.