Re: Really newbie question!
There are some vacuums specifically for this kind of thing, but they're pretty ridiculously priced, so a hoover could work. However, I think just aerosol itself would do much better. Just never use anything like a Swiffer, because it uses a static charge to attract dust, and this static could potentially cause damage (NEVER use it over a motherboard).
As for your second problem, make sure you're using thicker paper. Sometimes the super cheap stuff is extra thin, and the rollers suck 'em in two or three at a time. However, since it's old, you probably need new rollers, or maybe even a new belt. But at that point, it's usually cheaper to just get a new printer for like $30. :\ The good news, though, is that'll last you another 5+ years, and you'll be able to get ink for it much more easily depending on how old it actually is.