Cardio before or after Weight lifting?

All depends. Just do your research and talk to professionals. I typically run first for 30-40 minutes and then do 15 minutes of free weights. I don't have enough energy to do free weights and then run. I have way more energy after I run.

Breaking up the cardio and weights is probably best but depends your time restraints or availability. Sometimes I will do one in the morning and then the other in the evening. Or alternate days.