Scorpions are very easy to care for, but they have drasticly different needs depending on the species. Some come from deserts, and may never see standing water in the wild. Others come from rainforests, and need high humidity at all times. Like with any new pet, do research before you get it.
I have 5 at the moment, including 2 that are semi-dangerous. The best tip I can give you is to keep their enclosures well covered. They are amazing escape artists. I had one climb on top of another, and go over the side of the tank with the one on the bottom holding on to the climbers tail, so they both escaped. Luckly I was cleaning the tank at the time, and was able put them both back without incident.