[chrismortimer66]

I don't know why you are training [goals etc], so I will play it like your a dude who wants to put some mass on and get strong with it.

You can train same workout every time you go the gym, this will mean good gains at first but your will plateau pretty early, or train more conventionaly and have a leg and chest day, shoulders and tricep day, and a back an bicep day. Which ever way you wish to train you will come to sticking point, just higher the reps and lower the weight you use, or vice versa lower the reps and higher the weight.

You should rest 2 days before each workout, as this allows muscle glyogen stores to be fully restored and as well as have them heal. 2 days also allows your CNS[central nervous system] to recuperate.

Sets should be 3 [2heavy, 1 light] not including warmups if needed.
reps should be 6-9 for heavy, 15-20 for light.
Once you have achieved 9 reps with a weight its time to add some more, same with light once you can do 20 easy reps, add a little more to bring you back down to 15.

Try and workout 3 times a week i.e. monday, wednesday and friday.
No more then 75 minutes per workout.
You should be good to go, if start to get concerned with cardio at all, train 30 minutes on non weightlifting days days.