The simplest ways on how to create any account in your World of Warcraft Legion private server through the worldserver console.
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How to create account?
In world server console type: bnet create name@name password
After this you need to create a game account first: account create name password
And finally you need to link the bnet account to game account: bnet link name@name gamename
How to create GM account?
You need to create a game account first: account create name password
then set the GM level: account set gmlevel name 3 1
and you need to link the bnet account to game account: bnet link name@name gamename
Warning! Some patches and features are working differently if you playing with GM account!