For SSL, you will need a public/private key. No matter what you need a certificate. To create one you can use the keytool that comes with the JAva SDK. Part of the key asks for company name, your name etc. For development purposes you really can answer them with anything. ALthough for production you want real information. The only field that has a requirement is the country one for it being two characters and follows the Country codes, so you can't make one up.
Then you just go into the server.xml in your tomcat sar directory and use the https configuration that is there and point it to your keystore.