I used
Mammut Ropes when I was climbing at the rock gym, Before you Gripe about the Price, remember its 30m's of rope, Enough for a bunch of stands
You will want to use a good Carabiner and a
Figure Eight knot to fasten your safety lead to the Drop Line. The
prussic will connect the safety drop Line to your harness/Carabiner. you can tie a onkey fist on the bottom to keep some weight on it if you want. or anchor it. That is assuming that the Harness you are using has a d ring on it,