Welcome. Is this the 5.3L or the 5.7 old style?
Ok, to replace the pump you first need to remove the ran shroud and fan so you have room to work. The tool for the fan and the tool to remove and install the pulley are usually ones that you can rent at the part stores. Then you pull the pulley of the power steering pump off. Behind there are 3 bolts. REmove those bolts and the one behind into the block.
Remove the lines and swap the parts you need to the new pump. Install reverse of removal and make sure the shaft of the pump is flush with the face of the pulley hub.
There is a fitting, O-ring Boss style on the back of the pump for the pressure and the return line is a simple hose clamp style.