Help with Power steering leaking on a 1984 C10

[woody96]

Help, I have a pretty good leak going on a 1984 c10 with PS......cannot tell if it is from either of the hoses, or from the PS pump, or the PS gearbox (right terminology?).....there is fluid dropping off of both hoses, also the PS pump as well drops falling off the bottom of the front of the PS gearbox...

.......can anyone give me some scoop here kinda where to start---replace the PS pump first--it is pretty cheap---$45 from Carquest, as well as the hoses?
Could the PS gearbox be leaking?-----is the PS gearbox expensive????----How do I replace, rebuild that?

Am I using the right terminology (PS pump/PS gearbox) in all of this.......basically---HELP!!! My Haynes is little help especially with pictures......