Pix 501 Help to configure from zero knowledge

Hi,
I have bougth a cisco 501 firewall, i need to configure it but i havent any idea.

I have 5 public ip address and 4 web servers.
I need to make nat from one ip to one server
I need to make accesible only port 80
I need to navigate with all the workstations to internet trougth the firewall.
I need to access from home to office via VPN

How i do it?
Its necessary to use one public ip to navigate how i configure it via PDM?
thanks i use graphical client