So your camera has a shutter angle of 220 degrees which gives an equivalent shutter speed of 1/39 at 24 fps.
More info here
https://super8arena.com/shutter_speed.php
If you want it to run on Auto rather than Manual you'll have to source a PX-14 2,7v mercury battery equivalent, don't know whether you can run it on manual without the mercury battery in place but I would have thought so.
Buying Super 8 film is fairly easy online in the UK but it's not cheap, the most cost effective place I've found for supply, dev and tele-cine (scanning) is Gauge Film
https://www.gaugefilm.co.uk/
I've used them a couple of times over recent years and found them good to deal with.
@gazmorton2000 Also shoots Super 8 occasionally so you may be able to pick his brains re suppliers, dev'ing etc.
You can see some of his work here
https://vimeo.com/user17980686 IMHO perfect examples of the art of the 3 minute Super 8 movie.