I wouldn't start off at 500mg test 'and' 350mg tren! That's a starting dose for each. If you start off at 350mg tren, then start off with a lose dose of test just to prevent being in a state of low or no test. Once you know how you react to the tren you can up the dose of the tren 'or' the test. That's if you want to play it as safe as you can.