There are some tabs onsite. Check the essential pages How to play CBG and some of the links on the right side of the page. There's a lot of tabs on site, but I can't remember where at the moment. Someone else will know if you can't find it where I mentioned.
Welcome to Asylum Ben the "Hotel California" of CBG builders. In the essential page, go to how to play. Glenn Watts ,Shane Speal, Del Puckett are all good videos to learn from. On you tube you have " Uncle Mike". Justin Johnson(I belive that's his name) are all valuable resources. If you hit a snag just ask, someone here has done it or something close to it to give advice. Once again welcome.
for rockabilly a fretted CBG would be best especially as you say you havent played before. trying to get the right note on a fretless is a lot harder. you can still play slide on a fretted CBG.
real raised frets..lol
the idea of frets is that if the string is tuned correctly then each tone at each fret is correct in pitch. on a fretless you dont get the "stepped "effect and the pitch changes as you finger moves up and down the neck of the guitar.so if you dont get it exactly in the right spot the note will be off pitch.
example would be when a child learns the violin.. no frets so the pitch is off untill they play enough to learn where exactly to put a finger for the note they want...
and there are no silly questions. we all have to learn from scratch at some time in our lives. i just happened to start a few years before you.lol