Black Market is a tricky place, it not named black for no thing. If you wish to start your walk down the hole, you gonna find some great guidance and map. For example, you will need some different dark web tools for browsing deep net cautiously, like tor browser and a lot more. Or, you would have to bear alternative habits for browsing onion web, not to leave footprints.
Good thing there is some websites created to walk you through complex world of underground deep web hidden from the surface. This one is the best one i know http://darknet-markets.site/
Darknet-markets.site - is an absolute guide into the world of dark web.
It got what you need : greatest onion, the total guides for anonymity, guide for onion marketplaces, dark web reviews, recent, updated and legit onion markets onion URL.