A:Answer This PC does indeed come with all the power cords and ect you will need.
Personally, I prefer track balls (I'm a former trucker), but a wired mouse is included with the PC.
The machine handles my wireless trackball with no problems what-so-ever, so I am sure you will have no trouble with whatever device you will wish to add later.
It has many ports of various types, so (again) you should have no trouble with whatever device you will wish to add later.