I second that this is probably not the best way to spend your money. But if you really want to:
They make a variety of cheap lasers that mount to the front of the trigger guard. These are pretty much universal. Check Sportsmans Guide or a good Airsoft store/site. I doubt you'd find a holster though.
As for the optics, that's harder. The BSA isin't really strong enough to mount on the slide, but you could screw a rail to the slide and try it. It might take a little tweaking for the added slide mass. Or you could get one of the various frame mounts that are on the market for other guns and try to adapt it to your Taurus. Maybe some good strong epoxy to the polymer frame? Either way, if you really want optics, it'll take a little work and be a one off custom kind of thing. Bolt-on mounts don't exist for that pistol.
Just curious, but why? Other then it might be neat, of course.