All steps step by step

Hi guys, I am from India and there is datura plant on everywhere. But I don't know how to take it .. Am I take dry or new wet seeds?? How many? What the precautions I need to take before doing? Is it all though safe alone?? What are the bad sides of it? Which things I needed to remember? Something others I need to know before?

Actually it's the first time. I am scared a bit of it because I don't know completely which things I needed to know.