You have probably experienced newbie gains up untill now....
You can gain as a newbie no matter what you do... Once to plateau you need to start to think about things....
You need to learn how to become progressive in your training and diet... It is a long process of learning what you respond well to and what you don't.....
You do not need AAS'
Would you please post your full diet and full training routine.... Those areas need to now get nailed down perfectly or your not going to continue to progress....