If you don't understand IOTA related terms, check out our Glossary!
The requirements for a headless node are a static IP, IP adresses of your future neighbours and a computer that's running near 24/7 (in order to stay synchronized with the network)!
Furthermore you will need to download Nostalgia, a simple UI for your browser (running only locally), with which you can access your node.
Learn the basics on how a full node functions!
Learn what a static IP is and why you need one in order to run a full node!