Ahh, the deep web. You are bound to get caught using that, even the most clever, careful criminals on the network will get busted by some sort of trojan. There is an entire Linux distribution dedicated to Tor called TAILS.
Onion sites take longer to load because internet traffic through Tor is heavily encrypted and the encrypted traffic passes through as series of "relay" computers volunteered to make The Onion Router (Tor) more stable. I've actually checked it out, I've stayed away from things like child porn, snuff films, porn and hacked webcams among other shady things. I haven't bought anything either (to all law enforcement entities I have committed no crimes in case you are looking here, which you shouldn't be) I just checked out some black markets like Nucleus, Agora, Alphabay and more. Heroin, LSD and marijuana are most popular by far but they offer methadone, methamphetamine, amphetamines, cocaine, shrooms, ectasy, xanax and basically any drug you can think of. You can also purchase weapons such as military grade weapons, bombs and for people that live in Canada there are butterfly knives and tasers. There is also DIY bomb and drug tutorials along with ingredients to create/cook drugs.
It is a shady place, it gets distracting. I spent a lot of time looking at sites with interesting things until I got bored of it after 2 months.
You guys you check it out (don't commit crimes) it isn't illegal to look at darknet markets.
Download the Tor Browser, on Windows it's straight forward, mac I have no clue, Linux you must extract the .xz file to your desktop, open it and click Setup then you are good to go. If you want to visit sites go on thehiddenwiki.org by the way almost all of the links that claim to sell things are spoofed check DeepDotWeb to make sure there real because it could get your IP and your address.
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"God may not play dice with the universe, but something strange is going on with prime numbers."
-Paul Erdos
"There are two types of cryptography in this world: cryptography that will stop your kid sister from looking at your files, and cryptography that will stop major governments from reading your files."
-Bruce Schneider