How do I become a great project leader?

to be a good project Leader, you should show the example for every one in the team.

share the targets and responsiblities of the project for each member and hold weekly or monthly meeting to know the results and solve the problems which face any member

finally, the project leader will success only when give feeling of success for each member and gain will back on all of them not only for project leader

By understanding people.

they are your biggest asses in any project