if you're publishing for android everything is much simpler. you can create your own (good for 35 years) self-signed publishing certificate.
flash cc and cc 2014 were significantly easier to use with a usb-plugged in mobile device (including android devices).
after connecting your android device via usb and your os recognizes the usb plugged-in android device, click control>test movie>on device via usb>refresh device list (unless the device is already listed in which case you can just click the device listed). when you publish your app will be published on you mobile.
but the, by far, best part is you can debug (ie, use trace and see error messages) on your flash pro computer while running your app on your mobile by clicking debug>test movie>on device via usb>and select your mobile (or refresh just like above).
as for android screen sizes, just like idevices, there are a number of sizes. here are common ones:
- xlarge screens are at least 960dp x 720dp
- large screens are at least 640dp x 480dp
- normal screens are at least 470dp x 320dp
- small screens are at least 426dp x 320dp
i usually use a stage size that the client thinks is most important and then i publish for full screen. you can then pick the best (for you) stage scalemode option.