Sprint HTC Hero :: Select And Delete Multiple Emails On Phone / Get Rid Of All Spam Mail?

I just upgraded from a five year old phone, so apologies in advance. The geeks at Best Buy set up my email for me which works fine (after multiple trips back to the store). Except that I can't figure out how to do a couple of things. 1. Is there a way to select and delete multiple emails on the phone and 2. How do I get rid of all my spam mail that comes in on the laptop (and gets filtered out there). Do I have to set up some kind of email push program so that the email comes in from my computer (already filtered) instead of from the server? You can see my learning curve is steep.........