Have you tried doing a Google search for topics related to market places on the dark web?
even if you try it, I think you will never be able to find it, because google or something pertinent certainly will block that place. but you can find the black market in the deep web, I guess you've heard of it, if not, maybe you should look for its own information
First of all you need a tor client, since most of the dark places work on a .union extention. Then you also need a 'dark' mailadress
so you can't be traced.
It's .onion, not .Union, lol.
Anybody who needs good information and tutorials on darknet markets, anonymity and opsec, and all related things - go to deepdotweb.com.
It's a handy site, although I am not a fan of darknet sites or the darnket, it is intriguing to read about it.
Having said that, be carefullthere, since a lot of police men are present on the darknet, looking for newbies like you and me.
You can surf the darknet safely using tor browser just remeber not to enter on illegal sites out there. Most of the sites on darknet are illegal fraud scams but there are some are not. If youre really afraid to surf on deepweb then leave it.