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Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Both sets of phones will work fine.
NBN is a voip service, so you don't need a special digital phone, they will supply you with a voip gateway or ATA device, basically a small box with a few telephone ports on it which runs through your internet connection. In your case with 2 systems, you could plug a telephone cord in between that gateway box and an existing telephone wall jack. The other phones already in the home can then be routed to the gateway and supply your telephone connection.
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