long press.... for all of your ?'s
On the message (I use handcent, don't know about stock messaging app), long press and a menu pops up on the screen. Hit forward, pick your recipients and hit send.
Copy paste:
long press on webpage, e-mail, pretty much whatever. Hit copy text. Drag finger (or use trackball, may be easier). Text should be highlighted in yellow. Let go, text it copied. Go wherever you have text input and long press, paste.