1. what to mine and how to mine and what to expect. (I am unclear on where to start)
Started from you reading about Mining types (like Mining use hardware or Cloudmining), Pools of Mining.
2. I also want to know how to find out the hash rate of a device.
2. you can go to this :
https://whattomine.com/4. Suppose I start mining coin 'A' and then I want to mine coin 'B'. Is it a good thing to switch? Is is even possible to switch like this?
4. Yes, maybe if you think a coin 'A' profit is low than a coin B.