So many questions

Ive decided some of the things I need to know about mechanical engineering before I attempt to write a paper on it are things like what kind of jobs can you get by studying mechanical engineering? What is an average salery for a mechanical engineer? How much education do you need before you can become a mechanical engineer? Questions like these are very important and ones I plan on answering in my essay. If anyone has anymore questions they think I should look up please comment.