Network Schema

Hello there,

I am working in my school's final project and it's supose to draw a school's
network schema.

I have this information

* There will be 3 separate networks:
- students
- teachers/administration
- wireless
* Students cannot reach Administration
* Wireless cannot reach Administration

* 2 DC servers (students/administration) - Windows 2003 Server
* 1 ISA Server
* 1 HTTP Server & FTP Server

* There will be a CISCO Router...
* ...and a Layer 3 Switch
- This one would control the 3 separate networks

I have low experience in working with networks, so I was wondering if anyone
could give some ideas about the beste schema for this network.

I'm sorry if this is out of context in this newsgroup.

Thanks in advance,

Marco Pais