Using a keyboard of any description is not well defined. The apple TV remote is not useable for web surfing. I can’t find information regarding using my iPod touch, although I have seen it mentioned that you can. Using an apple wireless mouse and keyboard would be ideal.
The trouble is, that the AppleTV does NOT have Bluetooth capability.
Therefore you need to use the USB-Keyboard/Mouse, or iPod-Touch/iPhone.
I use the Logitech Dinovo edge Bluetooth keyboard with my AppleTV: