Everything around the address: getting onto Tor, verifying, paying, escrow, and staying safe.
Work through them in order rather than picking the interesting ones. Set up the browser first, because everything after it assumes the browser is genuine. Then the address check, which is the habit preventing the most expensive mistake available. Then the coin decision, which on this market is unusual: four options, and only one leaves no permanent public record.
Access and verification deal with getting in and knowing you are in the right place. Payment covers the four accepted coins, funding an order and what escrow does with the money afterwards. Safety covers the habits that matter and the fraud shapes that keep recurring. Troubleshooting is for when a page will not load, and it starts by reading the error rather than the symptom.
About an hour for a first sitting, and almost all of it is setup you never repeat. Installing and verifying the browser is fifteen minutes, hardening it is two clicks, setting up an account carefully is ten. After that a visit is a couple of minutes plus however long the network takes.
Skipping the download verification because the file looks fine. Retyping an onion instead of copying it. Reusing a username or password from elsewhere, which has nothing to do with Tor and loses more accounts than anything technical. And abandoning a page after fifteen seconds, which produces no information and costs the connection setup again.
That any market is safe. Every one that ever ended was operating normally the day before. These guides reduce specific named ways things go wrong, and anybody promising more than that is selling something.