Yes,it does. The Rebel 2000 calls this setting "Av" mode, which stands for manually setting the "aperture value." This setting controls the size of the lens opening that lets light in to fall on the film -- a larger aperture lets in more light, and vice versa. The older term for the same thing is "f-stop," since the size of the aperture is measured as a fraction (hence the "f") of the length of the lens. An f-stop (or Aperture Value) setting of 2 means the aperture is 1/2 the length of the lens (a relatively large aperture), and an 8 is 1/8th the length. Hope that helps.
The Rebel 2000 can use any Canon EOS EF mount (i.e., full-frame) lens ever made by Canon. It can not physically mount Canon EF-S lenses as these are designed only for digital cameras with smaller APS-C sized sesnors. Other third-party "digital-only" lenses such as Sigma DC and Tamron Di-II will fit on the camera but will cause severe vignetting (dark corners in images). The camera also can not use old manual Canon FD mount lenses from Canon's previous generation of film SLRs.
You can actually find some decent used third-party film-era lenses for film Rebels for great prices because many of these older third-party (Sigma, Tamron, Tokina, etc.) lenses aren't entirely comaptible with Canon DSLRs (Canon tweaked the electrical characteristics for their cameras when they went digital). Honest sellers will often mark these lenses as "film only", "not for digital", etc.