I don't disagree, but perhaps we should focus on what he's working with for the moment.
So this Lomo camera only has a shutter speed of a 100th of a second and an aperture (f-stop) of f/8; that puts you at EV 13 for ISO100 film, ev = exposure value. On wikipedia there is a chart for different EV's and the typical brigthness of a given scene.
Film speeds range from ISO (or ASA) 25, 50, 100, 200, 400, 800, 1600, etc: with many films fitting "in the gaps", like 64, 125, 320, etc. Each doubling of speed equals 1-stop. This would be the same as changing the aperture by one-stop, or changing the shutter speed. These 3 things, film speed, aperture and shutter speed, determine the exposure. They're are laid out in such a manner that the adjacent setting is a doubling or havling of exposure, depending which way you go. In photography, we generally pick our exposures by doubling or halving. A bit more control can be had with 1/2 and 1/3 stops, but this is not important at the moment.
You can buy any 35mm and put it in your camera; Lomo's film is generally considered to be a rip-off anyways. Kodak, Fuji, Ilford; that's the good stuff. This will give you more options with speed as well.
Since this camera has barely any control over the two most important things that a camera can do, f/stop and shutter speed, you have to pick your film to suit the environment you'll be shooting in.
If you're interested in understanding this better, just ask.