The wall-hung toilet’s supply line must have a male adapter with a temporary galvanized cap. Check the instructions on the toilet to get the proper location. Routing water supply lines is different in every bathroom, so you’ll have to adapt runs to your situation. But run the plastic drain lines and vents before starting any supply work. It’s much easier to route water supply lines around drain lines than to route drains and vents around supply lines. The same thinking applies to electrical work: Wait until the water supply work is finished before wiring.
Turn off the main water supply to the house, and in a convenient location, cut the hot and cold water supply pipes for the bathroom. Also cut out and remove all the existing water lines and fittings in the bathroom. Finally, cut out and remove the vent section leading to the sink and the main stack 5 in. below the vent tee. Stuff rags into open drain lines to keep sewer gas out of the house.