There's a Spanish creative studio called Barfutura, which released in 2012 a project for a poster design entitled " The Title". If your're a noob at design, maybe this poster-template-style may give you some help. It has everything a poster needs to have!
Beyond the movie title, all of these posters have a small slogan, for eg. in Interstellar "The end of mankind will not be the end of us.". They usually have the producer's name and some of most important actors, to attract fans to go watch it.
Do you choose the movies you want to watch by their "cover" or by their trailer??? Share your thoughts in the comments!