You asked:

1. Inrunner means a powered shaft, outrunner means a powered outer can?

Yes, and the powered outer shell drives a shaft.

2. kv is how many rpm per volt the motor does?

Yes

3. Amps is how many amps it will pull at full chat?


Yes.

4. Wattage is similar to any other motor, in that its volts x amps and therefore the max power it gives off regardless of can size?

Yes.

Outrunners usually have a lower kv rating than inrunners.