Greetings,
Mr. AJH. There are numerous threads dealing with water systems that explain the procedure much better than I can but before you start THAT process might I suggest you fill the tank with
just water first. IF there are any problems you'll only be dealing with water and not the conditioning solution.
This will be an excellent exercise in "bonding" with your new mistress. This
may be a 2 person job initially. Put a hose in the fill pipe and turn it on. Immediately look at and listen to as many bits and pieces of the water system you know about and have access to. Look and listen for any leaks. Trace out all your water lines and make a diagram including any valves or unions/joints.
The water pump may or may not need priming depending on it's location and the length of time it has been out of service.
Wear your "wet" gear.