How to check my house for termites?
Here's another post with good tips: Any words of advice on dealing with termites?

In terms of prevention, you can pickup a package of traps at the local hardware store and install them yourself. You should also avoid the ground coming into contact with surfaces that termites can infest.  That means you should keep mulch well below any siding and fences, keep wood piles away from the building, and make sure that bushes and trees are trimmed back.