Trying to sync your device to your computer?  See:

Basic Navigation through the ActiveSync minefield
Fixing my ActiveSync connection . . . again!
Syncing to a Vista computer
Use Bluetooth to sync your Pocket PC
Using Bluetooth to sync your WM6.1 mobile device

To find out how you can connect your Windows Mobile device to the internet, see:

How do I connect my Pocket PC to the internet?
Connect your Pocket PC to a WIFI access point
Pocket PC networking
Use your mobile phone to get your Pocket PC online

To learn how to install software, manage files and access applications, see:

I bought a piece of software, now what do I do?
Take charge of your files
Taking shortcuts

It is never a good idea to use a Windows Mobile device as your primary data repository.  At the very least, you should backup your device regularly:

Backing up and deleting PIM data (WM5.0)
For peace of mind . . . backup your Pocket PC
Another backup option!

Now that you've gotten your device connected to the internet, you'll probably want to set up your email accounts:

Handling email on your Pocket PC
WM6.1: Email & text messaging
Frequently Asked Questions about email

Get the most out of your Windows Mobile device.  Here's some more software you might want to check out:

What's in my Pocket?
Microsoft Live Search for mobile
Posting to the blog from a Pocket PC
Speech & Voice Commander / Dialer Applications
Phone Alarm: A must have application for every Pocket PC
A Pocket Full of Books
Getting into Shape with my Pocket PC
Tracking the weather
Java Applications
Gmail's Java application works on the Pocket PC
Get threaded text messaging now
Comparing PDF Readers
Adobe Reader for Pocket PC
Printing on the go with PrintBoy7
Viewing and editing photos with XnView Pocket
Staying informed with NewsGator Go!
Looking for a good email application? Check out nPOPuk
Cooking in the Mobile Cloud
SKTools Goodness

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