If I want to add Another instance of SQL Server 2005 Then what

Hi,

I want to add Another SQL Server 2005 instance on A cluster achine.Then Please answer of below queries.

1. Virtual Server Name:-Have to Use Same of a first Instance or Different.
2. Network to Use:-Have to Use Same of a first Instance or Different.
3. Ip Address:-    Have to Use Same of a first Instance or Different.
4. Network Address:-Have to Use Same of a first Instance or Different.
5. Network Subnet:-Have to Use Same of a first Instance or Different.

And please let me know if anything else is required.