How to start selling accounts?

I am looking to start building accounts and selling them on, preferably nmz start accounts also skillers.
I understand there is demand for these accounts and just wanted some advice on how to gain reputation and trust in being the original creator?

My idea was maybe to give away some accounts that I'd trained up previously although I could see this not working as I imagine some would trade wealth over using the skills I've gained to another account, or maybe this would be a good idea.

If you buy accounts could you let me know what you look for from new sellers to see if they're trustworthy or if you sold some accounts how to start out selling accounts?!

Thankyou for the read, Troy!