Basically, the phone should take care of itself when you step off the plane. It will search for available networks, look for your preferred network (Rogers) which it won't find, look for partner carriers, and then look for available carriers (assuming your phone network setting is set on Automatic). You'll get a little welcome text message from Rogers welcoming you to your destination.
That said, once in a while you will pick up a network that is GSM, GPRS or edge. In that case, just switch your network setting to MANUAL and it will scan for available networks. It will then list them and you can try each one and see if any give you full EDGE.
Then you're in business! Keep an eye on your data usage of course, roaming data costs money; I didn't find it unreasonable but I also didn't download programs and such while I was overseas.
What you might want to do, if time isn't of the essense for emails and such is just manually retrieve your emails, get weather updates, newsfeeds and so on just a few times a day. Just set the data services to off, and then turn them on to retrieve emails and get data updates, do your replies, and shut it off afterwards. You'll still have voice and sms capabilities during this time. If roaming data charges aren't an issue, don't bother with that suggestion of course.
Edit/Add: you didn't really mention if the trip was for business or pleasure and/or who is footing the bill; but you can also look at prepaid sim cards while you're over there to meet your voice/sms needs and just swap in your Rogers sim card for when you need to do data (assuming you don't need live data 24/7). That does require the phone to be unlocked however. But it might be worth the expense to unlock it using 3rd party unlockers (Rogers won't do it for you even if you're a longtime customer, generally although I have heard stories of $300 fees) and save on voice by using a local prepaid sim.