Try to get skin products for your skin type, they will usually describe type of skin it gets the most results for.  If you have oily skin, breakout a lot, or really sensitive skin, try to look for the word non-allergenic on your skin care products.

For pimples, wet tea bags help a lot.  They help in almost any blemish or burn.  Just relax for 30 minutes with a couple on blemish spots, and you can get good results.

If you have bad acne, make sure you where your hair up at night and whenever you can.  The oils in your hair may be causing break-outs.

Don't ever use dirty or used wash clothes.  They carry germs, and cause break-outs.

Don't think going without sun screen makes you look gorgeous.  Maybe it gives you a bit of a short term tan, but in the long run it can give serious skin problems.  USE SUN SCREEN WHENEVER POSSIBLE.  If you want to get a bit of a tan, use 8-15 SPF.