I would not trust any school that said they would hire you as a flight instructor if you learned there.
One place I learned, many years ago, didn't hire me even though I had done com/inst.multi cfi there.
Found another job at an airport 8 miles away and then the first place went out of business.
As to instructors, YOU call the shots. Don't pay up front and you ALWAYS have the power about which instructor you want or get.
I've seen instructors frighten students too much instead of helping them learn.