Newbie needs info on modest laptop speakers

Hi - I'm very much a newbie...so everything I've browsed in the forums so far looks like Greek to me...!! I have a laptop provided by my employer so am limited to what I can do, except maybe hook up a good set of speakers. What I'm looking for is "gotchas" like the speakers need to be a minimum wattage, etc.
for a Dell D630 Latitude. Thank you!!