First you have to download the IoP-Core Wallet for your Operating-System (32 or 64 Bit).
Now install the Wallet as usually.
Now, you have to open the port „4877“ in the Windows-Firewall.
Therefore please open the Advanced Settings of the Windows Firewall in the Control Panel.
Now open on the left side the „Inbound Roules“ and click on the right side on „New inbound Rule“. Create here a new Inbound Rule for Port „4877“, but pay attention to select „Allow the connection“ and activate the Rule in all Types of Networks. Also you could give your new Rule a name.
Then you have to do this again with the „Outbound Rules“.
Now you could setup your wallet so that it would be started automatically when your system is booted.
Now you could start your Wallet again, and finally after a full sync of the Blockchain – you got a full node.
Infos how to do this, you should easily find by a short google search with the keywords „Portforwarding Fritzbox“ (Fritzbox have to be your Router-Name).
Have fun, and thank you for Supporting the Fermat-Network.