Answer #1 - Blank Carbon Copy, or BCC, allows you to send an e-mail to multiple people without them seeing each other on the list. To send e-mails to people in this manner, click Create Mail to start a new message, and click the To: button. That will bring up the Select Recipients window, and you will have your Contacts listed in there, as well as boxes for To:, CC:, and BCC:. You will want to put the e-mail addresses in the BCC: box
Answer #2 - Outlook Express does not include a Junk Mail feature. You can block people who send you Junk Mail, though, by selecting an e-mail they have sent you, then clicking on Message in your menu and clicking on Block Sender.
I hope that was simple enough to be helpful!
~Noah