What sort of cheat sheets should a new DM have for a better flowing 5e game of Dungeons and Dragons?

The question is, what should a DM screen essentially have?

I’m new at playing and DMing, altough a lot of experience watching games, just got a group to play with now.

Started with the starter set in 5E and the Lost Mine of Phandelver adventure, however I’ve noticed the game can come to a stop when checking the rules or how to do something, while getting the books and stuff like that.

So I thought to make a DM screen with some cheat sheets, of the most usual things new players, and new DM’s have doubts on, and how to make the game flow well without long rule-checking breaks.

What should be on that screen?

So far this is what I found http://imgur.com/a/IXjjg but not sure if it has all I need or so much stuff that’ll also make the game stop a lot while cheking it out.