You will need the steering box, the pump, hoses and brackets to hold the box to the frame and the pump to the engine and power steering belt and possibly new drive pulleys to drive the pump.
If the Jeep is lifted you may also consider a Pitman arm with a kink in it to drop the business end down so the steering arm is more horizontal. Also make sure the bracketery you use to mount the steering box is super tough, there is a lot of force passing through that bracket when you hit rocks etc.
When you fit the pump it should be in the top right position and driven from the cranshaft pulley and the belt looped over the water pump pulley. Check your pulleys have a spare groove for this belt.
This diagram is useful but also shows an air pump near the power steering pump which I presume you do not have.
BagusJeep lives in Bali.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1947 Willys CJ2A/3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE