I think you need to do a lot more research. Start with Book Online, after that look for the HA/DR whitepapers from Microsoft. Alternately, suggest to your client that they hire someone with HA/DR experience to design and implement the solution.

HA/DR is not an area that you want to make mistakes in, mistakes cost money, they cost jobs.

Edit: You also absolutely have to design it according to the client's RPO and RTO and then implement a test setup and see how well it works.