1) Why do you want another howto, the setup is fine for this. You just have to use a provider like dyndns if you have no fixed IP.
2) No, dont doi that.
3) Di not remove bind.
4) Use a external DNS provider like dyndns and do not configure the domains in the ISPConfig DNS manager.
5) You answered your question already yourself
I had configured step 7&8 with encryption and I think the sys was waiting for a passphrase under the blue screen.