"guy at the gym suggestion"
Idiots! Never do deca alone, this can cause permanent damage to your hormones in some cases. I know one guy who did exactly this and he is now on TRT after one cycle.
You really need to do a lot of reading before you do any of this. You need to put a lot more effort into understanding theory and practice of PCT and until you understand how and why almost everything you read about PCT is wrong, you do not know what to do. Find the stickies.