Affiliate Marketing Secrets

I am 24. I am good at programming and puzzle solving. I am pretty much everything a perfect computer geek needs to be. I would like to create niche blogs but I don’t see where I should start and what topic would be ideal for me. Could you suggest a way for me to get things going?

My girlfriend said she had been drugged for days. She had been drugged with caffine.She went to the same market everyday.And somebody in exteme secret put the caffined vegetables and fruits on her way. She took them unconsciously. She couldn’t go to sleep for a whole week.
She told me that she had an invisible enemy. And no one in her family would like to trust her.She was almost mad because she couldn’t get enough sleep; and because she couldn’t find out who the enemy was.
I am stupid too. I asked the vege and fruit dealers.No one knows.No one tells.
How can i find out that guy on such a large market?
She is dying and I can’t help.Yet I believe she is telling the truth. It is overdosed caffine that has been torturing her.
Thank you if anybody would help me out of the deathly puzzle.