Which screen are you using? I think for rotating the screen you should modify the config.txt in your boot partition (e.g. by putting the sd card into your PC). The gapps script has to be started on the host machine, not on the pi itself. You will need a Linux distribution for that. As I have mentioned in another thread, we will provide a more convinient way of installing gapps in a couple of weeks. For both tasks, you should be using ADB over Ethernet, instead of SSH ("adb connect <ip of your device>").
If you do need SSH, you have to config it manually (we are currently setting up an automatic configuration). Let me know, if you really need it right now.
