I have a Character 151 lvl in Account A and want to transfer to account B.

Account A has 4 character but only one is 151 lvl.
Account B has 4 character too and one space open for Account A transfer.

When i go Item shop. which account i should log in?

Which account i should buy the Ecoins?

Does one space open for one charactore is ok?

Does the account bind item from Account A transfer too?

Will Item disapper after the transfer.? ( character using it when transfer).