Bro
Any legit source is going to require that you be introduced by a current and trusted long time customer. So your goal should be to make a friend who uses dnp and has a solid relationship with a legit supplier. Once you build up trust with your friend he may introduce you to his supplier. He would do it via encrypted email and never talk to you about it on PM. It would go something like.... he emails his source providing your hush mail Addy.... and then he gives you instructions that you follow to the letter that should result in the dnp source sending you a long email with rules and methods and prices and instructions. You make large order because the stuff lasts forever. Prob around 300 bucks to start.
With your stats only an idiot would represent you and anyone hitting you up on IM as a seller is prob going to scam you. This is not wall mart bro. You stick around, make contributions, develop relationships, learn, and one day it will become clear whom of your friends that you should ask for an intro.