I'm a newbie at taking portraits. I have been asked to take pictures of an outdoor children's birthday party. The party will be held in the evening around 3:30pm. I am only used to shooting pictures after the sun goes down around 7pm, which is my favorite time to get good sharp pictures. Could someone give me some suggestions on some settings? Some of the pictures will be taken under a covered picnic table and some will be taken under a tree. This area is around a lake. Any help will be appreciated. :-) I have the standard lens 18-55mm that came with the camera and also a AF 50mm f/1.4g, and a 55-200mm lens.