Pressed addies are often, perhaps usually meth.
I started by lurking in Reddit subs for a few months to learn the lingo, learned a lot perusing threads in r/darknet and uk trees. From there I discovered the dnn bible and studied that for a few weeks, taught myself to use crypto pgp tor tails etc and then found my way to a well known darknet forum which I'll not name and inferred the rest from there until I felt comfortable accessing verifying and transacting on the markets.
Recently I've been using telegram because it's convenient and the market scene has been a mess for a while.
It's not hard to figure out if you're a patient diligent and skeptical researcher, but the golden rule is that you can't ask for guidance anywhere on the clearweb. All the info you need to point you in the right direction is out there you just have to take your time digging and doing your own due diligence
If you start asking questions here on Reddit or anywhere else on the clearweb you'll just get scammed. Anyone who approaches you offering to help or link you to a vendor is just trying to scam you.
I know you said you're not sourcing, but you are so expect this thread to be locked.
Golden rule, don't ask questions. Figure it out on your own. I did and I'm a moron.
Best of luck!