How to Cook Ribs in the Oven

1. Prepare the ribs by removing the membrane which still may be on the underside of the rib cage and then seasoning them to your own liking. Garlic, pepper, salt,
2. Place heavy duty aluminum foil in a rectangular metal baking pan, with enough hanging over the edges to fold over and cover the pan while the meat is cooking. The pan should have at least two inch sides, and be large enough for all the meat to fit in one layer. Stacking the meat will cause it to cook unevenly, and very thick layers may result in some of the meat not being cooked thoroughly. 
3. Put water in the bottom of the pan, enough to give it a depth of one fourth inch. The water will create steam to keep the meat moist, while keeping the bottom of the pan and foil from scorching. This also reduces the actual temperature in the tent you'll create with the foil.
4. Place the ribs in the pan with the arch of the ribs up, so that you cannot see the bones as well.
5. Form a tent with aluminum foil over the meat.
6. Bake in a preheated oven at 325 degrees (F) for about an hour, with the ribs covered.
7. Remove the pan from the oven, and unfold the foil, then return to the oven, raise the temperature to 375 degrees and allow to cook 10 to 15 more minutes. This will allow the ribs to brown and will cook off some of the juices in the pan.
8. Remove and serve.

Source: http://www.wikihow.com/Cook-Ribs-in-the-Oven