Best way to set up accounts to try FF14?

[Purpleflavor]

If i wanted to trial 4x multiboxing FF14 to 60 (i think it's 60 free now) how should i go about setting up accounts? I accessed my old 2013 account and it wont let me try the free trial.

Should i start 4 new separate SquareEnix accounts (forget what they are called in FF)
Or should i start 1 new SquareEnix account and add more sub accounts on the same SquareEnix account? Does it work like Bnet?
Would there be a benefit to keeping my 2013 account and Subscribe on that account? If so how should i set up the other 3 accounts?