Every router is different, and I've never done it for more than 1 public address. So, Id start with just one server. Different services run on different ports so you can either forward all traffic to your server or just specific services.
If you want all traffic to your server you can often make a rule in the firewall menu on the router to forward all traffic, also referred to as dmz.
Or you can choose to forward specific traffic, eg, forward all traffic on port 80 (for web pages) to your internal ip.
Whilst you're exploring your router's settings you may find a setting to forward different public ip to internal ip.