Just got my first BB (8800) and am not thrilled but I want to give it a chance

First question
1. When I send a message blackberry sends me a copy of the message I just sent so it appears I have a new email when in fact it is just the one I sent. How can I make this stop?

2. I have a Mac. I see there is some synchronization software that I can download but it is unclear if this software allows me to manage the device from my desktop-- preferences etc...

Am I going to hate my blackberry if I am a mac user? Any advice is appreciated.

Thanks in advance
David