I'm not being sarcastic, I'm being truthful here.
Go check out regular gardening forums. You'll get more truthful unbiased information on horticulture there than you will on any mj forum.
Just be smart and don't mention mj.
Granted, here, if the right person(s) respond to your post you'll get great info.
Unfortunately for every two or three knowledgeable people here, there's 100 very confused people that will insist they're correct.
(sorry to put it that way riu people, but you know I'm right.)
For the beginner it can be difficult to know the good info from the bad, especially if a more advanced grower hasn't joined the thread.
Anyway, be sure to read, read, and read some more.
That's my advise.
edit: ^^ those two got in before me. Good advice from both, but I'd go for potting SOIL, not a potting mix, until you've got a few grows under your belt.