If you subscribe through Roku (not recommended for any number of reasons) all your subscriptions will automatically be available on every Roku device linked to the same Roku account. If you have a subscription directly with the provide and the provider is part of "single sign-on" then you won't have to sign-on on every device, but I have no idea what providers participate in it or whether it really works. In general, if you have a subscription directly with a provider you'll have to authenticate on every device the first time you start the channel/app.
The second question is easy. Each device maintains its own order of channels. There's no way to copy the order from one device to another.
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