The answer probably depends on which Classical Liberal you speak to, although you can probably take the following principles for granted:
- Personal Freedom
- Minimising Coercion
- Limited and Representative (Democratic) Government
- In favour of Property, Free Trade and Markets
- Free Speech
Some would add other principles, or emphasise some principles more than others. Some would hold that only a totally secular state can be properly free, whereas others would not hesitate to classify, for example, Pope St. John Paul II as a Classical Liberal.
(Classical Liberals tend to be called Libertarians in the US, because ‘Liberal’=leftard over there.)