The water softener water lines need to be connected to where the water comes in the house but B4 it branches away to the house, but after where the hose bib connections are so you don't waste $$$ watering the lawn and flowers with soft water.
Then you need to install a trap to the waste line somewhere and there must be a 2" air gap between the softeners discharge and the trap. Then you need an outlet for power or a good extension cord.
The softner can be located anywhere and the lines run to it but is is best to locate it as close to the water sourse as possible and run the drain line to the trap.
It sounds like you are on a slab. You need to find where the main shutoff is. Can you post some pixs of the piping?