Welcome on board. Yes, spend a little time researching, but please ask questions

Now, you say you want to kill the Dark Man? I would recommend a different approach. It is likely that he is a construct of your subconcious and being so, it is better to understand him than to kill him.

I suggest you work on control, this is good, but instead of killing him, sit him down somewhere and talk to him. Find out why he is doing this to you, it could take a little while, but will be worth it.

After you have learned all you can from him, ask him to leave you alone.

Good luck!