Hello altautah,
This is Kevin from Palm. Congratulations on your new Treo.
The first thing I would suggest is to please read the manual. That's the mantra on forums, read the manual, read the manual...
If possible, use your Treo for a few days without third-party software installed, to familiarize yourself with it's basic features/functions.
Have a plan for how to keep your data backed up, either by hotsyncing on a very regular basis or installing back up software.
When you're ready to start installing third party applications, be sure they list your Treo as compatible. Consider installing some uninstall/software management software. Then, install apps one at a time, preferably allowing a day or two between installations in order to be sure that the software is running smoothly and there are no conflicts with other functions of the device. Avoid installing numerous applications at the same time.
The Palm site can be a good resource. Check its main
Support pages for the latest updates, tips, tricks and the Knowledge Library.
Last, but not least, bookmark EverythingTreo, it is also a great resource, lots of experienced folks here willing to help. I'm sure they'll add to these suggestions in more detail.
Enjoy!
Kevin