start with a new pump, they are cheap. being you drove it dry i bet it died.
lets hope its not a rack, not the worst job to do but no fun either, i did mine in like 4 hours alone first time out.
for the pump, you need a GM power steering pulley puller, it will take your old one off, and put it back on the new pump. you can do the free rental deal for them or buy one. the one i got was 30 bucks. the pump was like 40, i got a duralast, we all know how we like to crap on duralast, but this pump is dead quiet, not a peep from it in the last 2 years.