It's good that you're taking up meditation. It's a great stress-buster!
Distracted while doing it? It's normal for beginners to experience loss of concentration midway. When that happens, just be aware of it and bring yourself back into it. Don't fight yourself or curse yourself for losing control, but flow with it and return to where you last lost control. That's awareness, a key point in the practice of meditation.
As for books, I'd recommend "Meditation for Dummies" from the Dummies series. It is well written and handles pertinent questions from beginners and seniors alike.