The iPad User Guide can be found in several places. You can go to the Apple website and go to the Support tab. Select iPad in the Get Support section of the page then select manuals. You can also download the free iBooks app and download the iPad User Manual as a free book. Also, you can use the online version using the link in Safari. Apple has several manuals in Russian, but not yet for the iPad. There is a Russian manual for the iPod Touch which is pretty close to the iPad.
As far as getting an external keyboard, I have not decided whether to get a Bluetooth keyboard or the the camera kit so I can use a "normal" USB keyboard.
Decisions, decisions!