Google app engine and angular and REST

Hi Experts,

I'd like to get a general sense of what to do with google app engine for use with a client written in angular.  Been reading about REST as well and I'm a bit stuck.  So very simple general questions here -

What should I use for logging in to my app that will work for everyone?

I'd like all responses from the server to be in JSON form- and with the router, I'd know on the client side what model to apply them to (I guess).  However, I'm confused with angular- everything is a page request - from what I've seen, so is there a REST style that "fits" with angular where I would modify the model that gets "hidden away" within an angular template (I'm sort of stuck in the backbone style way of thinking here)...

I hope you see what I'm confused about and can set me straight.... Much reading to do still.... :)

Thanks for any help!
Mike