My own preference?
1) z4root (definitely!)
2) Titanium Backup (immediately back everything up!)
3) ROM Manager (and install Clockwork Mod)
4) Reboot into Clockwork Mod, go to the backups menu and create an image backup of the system (once you've done that and copied your SD card's "clockworkmod" directory onto your PC for safe-keeping, you're as good as inoculated from pretty much anything else that can go wrong)
5) Install AdFree (enjoy!)
6) Install File Expert (delicious file manager!)
7) Use Titanium Backup to either uninstall apps or freeze system components (WARNING: You really shouldn't uninstall system apps, just put them into FREEZE status to prevent them from running--this way, if you ever want to apply an official update/patch from the carrier or manufacturer, the files are still there to be patched.. they just won't run.. sometimes removing system files will cause upgrades/patches to fail).
8) I like using Autostarts to disable all kind of crappy stuff that insists on autorunning at boot time or whenever you dock or undock or plug the power in or disconnected from power, etc. Autostarts will let you control what can run when events happen. Be careful with this tool, though.. there's lots of reasons that things need to get called during events--sometimes they need to be called to gracefully handle some events like when an SD card has been inserted or removed, for example.

I think you get the picture. From here on out, you're pretty much free to bend, fold, mutilate and otherwise have lots of fun with the tablet you now truly OWN for yourself.

As a new person, just getting into rooting/flashing, I would hold off flashing ROM's until later, after getting the hang of hacking around at what you've already got installed.. but down the road, absolutely!

Why are they using my family name?? I'LL SUE! I'm American! We do that!