Skin Care Products

(preferably products on sale in stores in the uk)
Well heres the story. Im 16, and have been suffering with moderate acne since i was 8-9 years old. So ive had confidence issues since before i hit puberty. I was using loads of products on my skin and it got worse, so i was told by my doctor to just wash with water, then use one type of skin product after about 6-12 months when the products are out of my system. However, seen as he isnt a dermatologist and there is none in the area, i was wonderng if the kind people of yahoo could recomend a skin care routine for me? thanks
BONUS QUESTION: Which moisturising cream is better for your skin, E45 or Nivea? thanks again x

I really want to protect my skin this summer. If I use several products that contain sunscreen, does this provide extra protection? For example, if I use an anti-aging serum with SPF 25, then a moisturizer with SPF 15, then a tinted moisturizer with SPF 20, does this add extra protection or am I just wasting my money?