Finishing 1st e-book

I have finally finished my book and am confused about what platform to use. Calibre was incredibly confusing and looked really time consuming compared to Kindle Create, which makes formatting really easy. The problem with Kindle Create is I don't believe there is an option to place the cover on any of the first pages (I'd really like to do this).

I really have no idea what I am doing, so any help would be really appreciated. I plan on publishing my book via Amazon before this year is up.