At the end of Act One comes the first plot point. A plot point is a hook in the action that spins it around and creates direction. Something happens that sets the course for the rest of the movie - eg. And that's what they'll spend Act Two doing. But it wouldn't make that great a film if they could complete their task in the next ten minutes.
Conflict is the essence of drama.
The character has to overcome a series of obstacles that you drop in their path. Create your characters and throw shit at them for 60 minutes. Let them struggle towards their goal. At the end of Act Two comes the second plot point. Now the character has been moving towards their goal for the last 60 minutes and it's usually by now that the the solution is in sight.