Well your bridge is a very personal thing...I've probably tried 5 different bridges in the last year...different applications might ask for different bridges. You have your general open bridge where the four fingers are spread wide but firm with the thumb pressed below the index's big knuckle. A closed bridge would have three fingers on the table with the index arched and the tip rests on the third finger's second knuckle, with the thumb on the table.
Try using a glove or powder for "gliding".
As for your grip, you should have your thumb pointing straight at the floor, 3 fingers gripping it strong but not choking and the pinky should loose, leaving you with full range of motion in your wrist.
Start there...just watch some pros around your local joints
edit: for straight shots, make sure you have a good solid stance, and get your body so your eyes are looking down the cue, much like you would aim a gun with. This will be difficult until you hammer out a consistent stroke, as that is what's going to cause the ball to go off...you might throw the ball if you don't strike it in the center.