For example, like I know I should have the electricians come do their work before the sheetrock/wall guys come and do their job.

(Even with a phantom ground) GFind a good electrician to confirm.

We hired plumbers and electricians to go through the apartment and basement to clean up the 100 year old rats nest of wires and leaking plumbing lines which were contributing to sky high water bills.

And yes, you should check.Like any other plumber, contractor, electrician... you fill in the blank, there are the good people and bad people in any group.If you are a reputable wholesaler like me, you will have people calling YOU to get on your list.

I feel this is pretty good because it includes licensed HVAC, electricians and plumbers.The owner of the PM company has his own apartments that he owns so I am hoping that they take care of my property the same way they take care of his.

In NJ, plumbers and electricians needs to be licensed. 

, contractors(Do people set a year long contract with plumbers, electrician, etc. when renting?)

Would you suggest advertisting for skilled individuals, like individual plumbers, electricians, painters, etc.?

I have an electrician and plumber doing their parts of the work.

I've had several differing opinions from electricians.