yoiu can trade all your pack items which are not bound to any other player. You can't trade merits. You can mail anything from a character, bound or not to your account @yourname in the in game mail and it becomes available for any of your characters checking the mailbox.
Bridge officers can be sold and fools already are putting starting BO's worth 100ec on the echange and asking 1000sc upwards.
I sold abot 10 items on the Exch today and made a few credits. I sell for about 85% of value and will continue to do so. Better have the cash than have stufff unsold for being greedy.
Don't know how to transfer items other then the through your fleet bank if your in a fleet., i haven't found the in game mailing system yet. As for transferring Bridge officers I know at some point you will be able to sell them back if they are BOE to the BO sales people on the various starbases. Maybe if that is activated you can drag them in your inventory or fleet bank.