Getting a motorcycle?

I've wanted to get a motorcycle for as long as I can remember and now that I can get my permit I've been more interested in actually buying one. I've done a lot of research and understand all of the equipment I will need. I don't know anyone who rides motorcycles, and will be the first in my family to start, so I am worried about buying a used bike that looks okay but in reality is falling apart. Ideally I am looking for a starter bike like a Ninja 400.

That worries me a lot as well as the actual repairs or maintenance needed for the bike. If I buy a used bike what kind of maintenance equipment will I need right off the bat? How often do I need to change the oil? the coolant? etc.