When using the same account name as before your contacts should just be there. If you go to http://webmail.aol.com they should be under contacts (click "contacts" within the left panel).

There is also a bcc feature available. When you compose mail, simply click the link "Bcc" to the right of the "To:" field to enable the field. If you want to enable it permanently, go to "Settings" (the link in the upper right, next to "help") then click on "Compose" and there check the "Always show Bcc field" option