1) You are going to have to rack the beer into the keg, just like you would a bottling bucket. The from vessel will be high, the keg low. You can use your racking cane, autosipon etc... Goes right in the big lid.
2) CO2 connections can be different and the connectors will only fit on one side. The keg should be labeled somewhere by the connection. One side should say IN the other OUT. If for some reason you can't find markings the CO2 will go in the side that has the very short tube sticking down into the keg. Beer will come out the side with the tube that goes to the bottom.
This thread should help with anymore kegging questions.