First, you need to get acquainted with your topic. Think of it like going on a date: you're trying to get to know the other person (your topic) without scaring them off because you're trying to talk about marriage, houses, and grandkids (i.e. your "real" research) on the first date. And, of course, once you've gotten to know them better, you're able to buy them gifts and guess what they would like, because you've taken the time to establish those little basic details.
The Three Rs
Is your source
Recent? Reliable? Relevant?
Is this source up-to-date? Is it about my topic, and does it go into enough depth? Does it come from an authoritative source? Is the information accurate (and are there citations given to back it up)? And why was this information written in the first place?