If you are a to-be-PM, be careful about selecting your best friend at work. In most cases it allows people (includes bosses) to understand you better by watching the type of people you hang out with. If you are seen with the trouble maker at work, it is assumed in most cases that you might not be the right person to be trusted with any confidential information.
Employees with the right company have chances of getting the best options when it comes to work.
Choose the right person and find ways to learn from the best. Try to let your immediate boss or PM know about your aims and ambitions; that you would be willing to take some extra work and learn the ropes. Everyone loves a hard working employee with the right attitude.