To be perfectly honest with you, Enki, given your answers I would probably recommend that you not use the steroids at all. At least not yet. It sounds like you have a decent muscular base and just diet and workout and cardio together will do a fine job for you without any problems or side effects.
Given your age it is generally not recommended by members here that you use steroids. You may read more about it here:
https://forums.steroid.com/anabolic-...-steroids.html
Of course, the choice is ultimately yours but I hope you will consider that.
I encourage you to go to the diet forum and post your diet plan for any feedback members might offer.