NJ real estate appraiser

[Kaoru Kitabayashi]

Hello, 

My wife and I have 3 family rentals in Newark for quite some time.   It went through good time and bad time as usual.  Since I read several books here in Bigger Pockets,  would like to expand more rental apartments.  To do so, I think to take real estate appraisal course for better understanding of house values and also it may help to change my day time work since current daytime work is bit shaky.     

My question is 1) is the knowledge of real estate appraisal help investment? Is it worth $750? 2) does real estate appraiser have a good job opportunity? 

If some knows, please advise.

Thank you.