I've been doing a bit with a Beaulieu 4008. Super-8 sound film is no longer made, so if you want to do live sound, you need to record it separately and sync it. I haven't gotten that far yet, but there are some sites with good info about recording sound, like http://www.super8sync.com/English/home_e.html .
Filmshooting.com is kind of the APUG of Super-8, with lots of info about small gauge film making, but in fact, a lot of the new interest in Super-8 is connected to the possibilities made available through telecine and digital editing. You can still do it the old fashioned way, though, and there are people who do. Also look at www.onsuper8.org for lots of info and links to other Super-8 sites.
Here's a site with some info on processing your own Super-8-- http://www.city-net.com/~fodder/hand/index.html
There's more out there. I've got my Lomo film tank, but haven't processed my own yet. Reversal chemistry I can manage, but loading the thing looks like a challenge.