Dark Net is a dark place, it not called deep for no thing. If you need to start your journey down rabbit hole, you would have to find some decent guidance and knowledge. For instance, you will need some appropriate onion tools for browsing tor network safely, like tor browser and a lot more. Or, you would have to acquire other habits for browsing onion net, not to allow footprints.
Hopefully there is few sites build to guide 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 through the world of dark web.
It got what you need : most popular onion, the total guides for anonymity, guide for dark web markets, onion reviews, new, updated and verified deep web marketplaces link.