The answers you finally favour will depend on things we usually forget even to think about. Once you are alert to these issues, though, some very exciting possibilities open up.
Most of this site is devoted to the research and truth questions, but you'll find my personal conclusions in the answers link. On the other hand, the web questions can be answered at once.
In the end, you will need a traditional library, but by that time you'll know exactly what you need and will save a lot of time.
If I'd done this project through traditional libraries, it would have taken weeks or even months. Instead, it took one whole afternoon, followed by five or six mini-sessions (and counting) to work out the details.