I'm coming from WebOS too, I actually don't get my Focus until the 12th, but I'd like to see a crash course too.
Really, the system is so intuitive you do not need much.
Go ahead and install zune.
Zune software, Zune HD players, and the Social | Zune.net
You use it for getting files and media to and from phone to computer.
Create a Windows Live account
Sign In
A windows live account is required, and it also gives you a lot of extra features like find phone, lock phone, etc. It also makes it easy to save pics and other content to the cloud. It has free 25gig of storage in the skyDrive. You can link your Windows Live account with Facebook, etc.
Remember to swipe left and right if it looks like there is more stuff there. And a lot of things have context menus you access by holding down on for a second. So for instance in email hold down on a email gets you essentially a "right click" menu.
Also, there are regions, so again in email, for instance, if you click all the way to the left on the list of messages, it will bring up a check box selector so you can select multiple messages at once, etc.
Other then simple things like that, just play and have fun.
And of course, check out ALL of my apps. Just search "Erlensoft" in the zune software