not too experienced with legs and wonderin if someone could lend a helpn hand

my essential goal is to work my legs to the point that will give good stimulation for my body to send growth signals so my natural growth hormone production increases and my natural testosterone production increases...

i usually do

squats - 4 sets of 10 to 5 reps (and 2 warm up sets)
leg press - 4 sets for each leg
lying leg curls - 4 sets each leg
leg extensions 3 sets each leg

just wondering if anyone could gimme help, thanks