To create a new movie you need an idea of what you are going to do, open the program, and choose your basic settings. After that you start creating. This shows you where to start.
Plan your movie
The movie you are making needs to consider a simple structure. The 4 Rs: Reflect, Record, Revise, Release
Choose your video settings
While the defaults do a lot of the thinking for you, understanding where to change creation standards and applying them to your needs happens here.