In you opinion is it better to do cardio before you work out or after you weight train? I have been doin it before and it seems fine but not sure if it may hurt my work out. What do you think?

Second I ain't much of a fan of cardio so all I do is ride the stationary bike for 30-40min 4 times a week with the resistance all the way up at a pace of about 40-50 rpm and burn about a thousand calories or so is this a good way to drop my BF%?? I will also be doing this while on a heavy duty steroid cycle.