If you already have a wired connection, and it does what you want, and you can understand that, then once a WiFi connection is made the apps will work the same. Don't worry about how it does it.
As for syncing there are at least 3 different programs that will do what you want with the Pre, and wondering how it is going to do it over the WiFi is unimportant. Check out the various Palm Pre forums to get an idea of what is in use.
To find out if you have WiFi is important, but you didn't tell us what sort of computer you have. Is it a desktop or a laptop? If it is a recent laptop it is more than likely to have WiFi.
If all you are using Outlook for is the calendar, then you might consider switching over to the FREE Google Calendar, which allows you to access your calendar (and you can have multiple calendars) from any computer on the Internet. Plus, the Palm Pre already gives immediate access to multiple Google Calendars now. All the update and syncing is done automatically.
I am thinking of buying a Palm Pre. Since I will not be able to "sync" my Microsoft Outlook's calendar and contacts via the "Microsoft Exchange" I will have to use a third party software called PocketMirror by Chapura (see: http://www.chapura.com/). Since I will be doing this from home and I have never (to my knowledge) used Wi-Fi before, I was wondering how this would work.
A few points to help:
1. I am using MS Office 2007 on XP Home
2. I do not use email via Outlook. I only use Outlook for the calendar and contacts functions because I can "sync" my current smart phone (a HTC) physically to the computer
3. I do not know anything about Wi-Fi except that you can "grab" a signal out of the air to connect to the internet on, say, your laptop while you are sitting in the coffee shop. I am not sure if my computer is "wi-fi capable" or even how to check
Thanks for your help