Because tofu has a pretty neutral flavour, you've really got culinary carte blanche when it comes to how you season it. BUT! Before you cook or marinate it, you really need to drain out any excess liquid. Slice your tofu into thin sheets or strips (about 3cm thick), wrap in a paper towel or tea towel, and place something heavy (like a thick pan or book) on top. Leave it for as long as possible, but at least 30 minutes. If you're going to cook tofu for dinner, just leave it draining in the fridge all day.
If you're low on time, you can just wrap it in a paper towel, and put it on a plate with another plate on top. Microwave for three minutes.