Hi Trystan;
There are many simple instruction manuals for a Bolex on the Internet, just do a Google search and you'll find the basics for shooting. The Tobin timelapse motor runs the camera at the equivelant of nearly three quaters of a second exposure time (Thats long ) so a simple way to cut down the light is to use an ND filter of 1.5, this will give you the equivelent exosure time of normal 24fps filming and is probably the least confusing for a begginer! Only prob is getting hold of an ND1.5 (not that easy), I know of a UK company www.galvoptics.fsnet.co.uk that will make you one! Around 30quid or 50 dollars (Aprox) email them for more info, I had them make me one for the same exact reason, it was a gel of 150x150mm which i stick infront of my lens, and if the filter slot is free you can just cut out little versions and slip them behind the lens.
Good luck;
Olly