Phone sync with PDA query

Sorry if this has been covered before, but I could use some advice from you
experienced people out there.

OK, I have a HP4150 iPAQ and a Sony Ericsson T610. The PDA has both
Bluetooth and wi-fi connectivity. I use the wi-fi with our wireless network
at home, and it pretty much set itself up, all I had to do was put in my
e-mail pop & smtp details. I use NTL on broadband.

Now, I want to be able to synchronise my PDA and phone (calendar and
contacts) and be able to browse the internet and get my e-mail on my PDA
using the bluetooth facility and (I presume) the phone as a modem.

I'm pretty technically minded, but I'm not sure how I should go about this.
I've downloaded the synch software fromt he Sony Ericsson site onto my PC
but not sure how that helps. How can I synch my PDA with my phone and do all
the stuff I mentioned above.

It's all about setting up in connectivity on the phone I reckon, but I
haven't a clue what the sttings should be. I've managed to get the PDA and
phone to recognise each other but now I'm feeling around in the dark, so to
speak..

Any help or step by step instructions would be much appreciated.

TIA
Tracey