So i was told you cannot shut this thing off and turn it back on every morning like a computer. You basically leave it on period.
Even if you unplug it, the magnet is on and will be on for awhile.
That's correct. The magnet requires no energy to maintain the magnetic field.
Once the electromagnet is charged, it will stay charged until the energy is released (either deliberately through a discharge circuit, or because the superconductiivty fails).
Even if you cut off all power, the magnet will remain energised. however, the helium would eventually evaporate (this would probably take a few days - weeks) and the superconductivity would fail - at which point the magent will lose its energy.
(Edit - removed reference to cooling systems. Most systems do not have their own helium coolers - instead the helium is allowed to evaporate and fresh helium is delivered on a regular basis).
Some MRI scanners do have cryocoolers to help reduce the evaporation of helium.
Most scanners do have an option to discharge the magnet - mainly for safety reasons - however, this is very rarely used.
The magnetic field is so strong, that the forces generated in the actual electromagnet itself are measured in tonnes. Discharging the magnet releases these forces, and there is a small risk that when this happens the magnet will fracture or buckle. With the going rate for a new magnet at about $ 1 million, you want to avoid this as far as possible.
Similarly, charging the magnet usually needs to be done by an engineer from the manufacturer - expensive, and best avoided.
As an aside, there is a lot of interest in cryogen free superconducting magnets. Essentially, cooling equipment is getting smaller and more efficient, meaning it is possible to attach the magnet directly to a piece of metal (e.g. copper) which is attached to the cooler. No need for any liquid helium or nitrogen. There are some prototype MRI scanners which use liquid-free superconducting magnets.