It's all down to your style, I like to play flamboyant, fast and accurate football. I like to attack.
Free kicks, if I'm 30m + out and there's a group or a free man near the box whip in a quick long ball by holding UP and then pressing for as long as you deem possible. Closer than 30m I usually have a crack, you'll have to learn how to take free kicks with your chosen taker as each one is different. However try to vary your free kicks and try something a little different every once in a while say if your on the edge of their area try getting a good striker and rolling the ball for him tro hit the way Shearer does it, this works well with people who have powerful shots.
For corners I tap once closer to the goal and cross it in either one notch below the middle or one notch above, while holding UP to get a quicker cross. If the cross taker is poor float the ball in holding :R2: and aim it one tap away from goal. Crossing with curl towards goal makes it easier to run onto I find.