Get good chairs with wheels, back support, and the ability to adjust seat height. Tables should either have recessed monitors or the ability to reduce the height of monitors. Avoid having windows if at all possible. Do a sound test ahead of time for machine, air conditioning, and fan noise. It should also have convenient access to all technology screens, boards and lights.
Lighting is an important factor when designing a classroom.
The room shouldn't have windows. If it does, you should black them out. Doing this also improves the noise too. Use dimmers or creative use of accent lights to reduce light on the screen. Assuming you have no dimmers, lights should be controlled from front to back and not all lights on one switch.