I think I can help here:
Make sure your headset and phone are charged before doing anything else. The blue light on your headset will come on when it is charging, and will shut off when fully charged.
To put your headset in pairing mode, make sure it is completely off first (no blinking blue light). Then hold down the Call button for 6-10 seconds until the blue light stays on. (It will likely flash once and shut off, but keep holding until it is all the way on and stays there!)
From there, go into the settings on your Droid 2 and access the bluetooth connections. Do a new scan for your headset if you don't see it listed, pair, and connect!