Looking to make a website where I sell bitcoins similar to pax.com. I intend to get bitcoin for a cheap price and resell for a markup thanks to convince. How do I go about this? Also, on the side I was thinking of niche ideas such as targeting the wealth who do coke. I search on Google with the keywords quit+cocaine and it comes up with 500k searches. Is this a low amount for competition or would I have to think more specifically in order to create mini niche pages for sales?