Every set is different, but there are some general strategies that can be applied in most drafts. Sometimes its best to follow your instincts instead of tips, but if you are a little stuck, these are concepts that can help you make a decision.
Choosing an obscure strategy could be a way to get powerful cards that other players are happy to pass over. If you get build-around cards early enough in the draft, you may be able to find enough support to get the engine online.
Playable two-drops go quickly so you may want to prioritize them over four- and five-drops.