I'm 14 too here's what i do...
1st.) Hygiene & Be Clean -
I never ever ever let my self get caught from a bad hygiene, Complete clean hygiene should be maintained, Don't share stuffs with others in anything! Spoon , Drinks or anything will have contact with your family members or anyone's saliva, I take a bath TWICE a day, and spend 1 hour minimum in bathroom...
2nd) Confidence -
Do not be shy at all time's when talking with anyone, Have a smile i always do my smiley face to be cute ^_^ , And very very polite to talk with, Have interesting topics to share with everytime avoid being boring boy who don't talk about stuffs and feels like boring to be with..
3rd ) Maintain weight Never be Obese -
I go to swimming schedule to maintain my body and weight, Maintain food you eat, If your Vegetarian stay with it, If your a meat eater stick with it but don't eat alot, 3 times a day should be maintain. ^_^
4rth) Concern the way you look, You're style, -
I never wear something to look fancy or do emo side phunk side, rock side, Be typical. Wear looks which suites for you... ^_^ be more like a kid, or in the mid age style, Don't go over looking like a mature guy or don't go over looking like a baby or immature side obviously...
5th) Always have motivative and be energised always!
I sleep atleast 8 hours , Eat well , And drink energy drink complete vitamins. to keep me going and happy,
6th) Have friends,
Have atleast 4 friends to hang with so your not a bored type of guy,
7th) Perfume fragrance or cologne you use must be attention focusing,
Always smell very very well and good, Use either fragrance or Eue de toilette or colognes....
8th) Wear gels additional if you have long hair ^_^
9th) Maintain face -
Avoid wrinkles / pimples / acne anything that ruins the face, - I use facewash , toner , day cream and night cream, Since i was 12 years old now i'm 14, reason i BARELY and almost very rare to have something to ruin my face..
10th) If you are hairy shave it! -
Depends of how you want but since you are only 14 shaving is more likely to do so when you are hairy, ^_^
That's all i can think of ^_^ that should be pretty well of helping you being attractive, ^_^ Goodluck dude..