Anything that isn't Cash Shop you can mail to you one of your mules.
This is cheap and efficient.
Anything Cash Shop and you'll have to either buy a Cash Shop item called a Common Bank, or you could get a friend to transfer for you.
You could also duel log and trade the items yourself. This is sometimes difficult to do and is a bannable offense.
A lot has changed from a year and a half ago.
Check current prices of Gpotato and make sure you price check before you attempt to sell anything.
If you have the money, train in Azria.
If you need help with anything, be sure to pm me.
I'll be happy to help to the best of my ability.