you should be using test e ideally 10-12 weeks (can go longer)....its a long esther which means it will take a few weeks to kick in....for me round about 5th week......if you only want to do 6-8 week cycles then have a look into test p.........i know some peeps will say your to young.......but youve allready started.....and id say 500 mg a week would be enough.....how much did you take on your first cycle and how long ago was it.....