Multi-Server setup help

[kentsch]

I would appreciate advice on the following Multi-Server setup (do you have better ideas on a starter multiserver setup?):

4 servers:
- Admin (first) server is also the primary DNS server
- Secondary DNS server (only needs myDNS on it), no ISPConfig
- Mail server
- Web Server

Do I need to install everything on the Admin (first) server or can I just install what I need for admin and obviously myDNS to be a dns server?

I assume there is a MySQL database that stores the all the ISPConfig data. Are the table formats available?

Any advice anyone has would be appreciate it. Thanks in advance.