"Silver things" are shoe cleats for clipless pedals. I believe the figure 8's are meant to fit under a different type of cleat. Yes, it's just a screwdriver. The small spanner is to hold in place the back portion of a chainring nut while you use an allen wrench to tighten it. A "fulcrum sleeve" is used as a stop for a Sturmey Archer shift cable (Google it). Huge nut may be a cartridge BB tool.