Just the fact that you asked this, suggests you need a short tutorial on using the mail:
Every suburb of your city has a mailbox, called the Norrathian Express. it lets you mail items (1 item or stack of identical items at a time) for 50 coppers, or money (any amount and combination of coppers through platinum) for 10 coppers. Attaching money alongside an item is still just 50 coppers total.
Where is the mailbox? Its different for each suburb. In Qeynos, Castleview, its just outside the inn, look right and forward 5 meters its right there. In Qeynos Harbor, from the harbor cross the bridge and head towards south Qeynos -- its on your left, next to the inn, about 8 meters from the bridge. If you're in Freeport, I think you only send mail to other Freeporters, but I'm not sure.
I can't for the life of me understand why anyone would want a Freeport toon anyway, so my advice there is just attack a guard and maybe you'll awake near a mailbox. If not, either way evil was set back a notch, and I'm up for that :)) (maybe kidding here)
Anyway, you can mail your other toons, which is safer than handing items and coin to other people to "hold" for you while you switch guys. One thing I've noticed, it takes several minutes for the item to arrive. So, with my 2 accounts and 7 people, sending items back and forth by mail had me waiting 20, sometimes 30 minutes for the item to arrive, even if I log off and on frequently. Just have patience, it will be there within the hour for sure.
You'll get a notification of mail waiting for you in your maintained spells window, right above food/water effects. It's hard to miss, so logging in will immediately let you know if mail is waiting. It's a good way to send things to people that are offline (not only your toons, but anyone). Mail can sit unopened for 28 days or so before it is auto-deleted.
You of course can write text as well, subject to the 10 copper minimum, 50 copper maximum postage cost.
OK, so now you're set to GO POSTAL!! YeeHaw