Here is the perfect skin for you if you've just bought MC, and you want a skin that looks awesome(ish), and you're a teenager. (For all you Noobs out there, a teenager is a 13, 14, 15, 16, 17, 18, or 19 year old person)
Please comment nicely, this is the first skin I've made from scratch. Enjoy!
1) Click the link
2) Right click then 'Save image as' And call it whatever you want and save it wherever you want
3) Go to minecraft.net/profile then scroll down to 'Change Skin'
4) Click 'Choose File' then click whatever you called the skin wherever you saved it
5) Press Upload
6) Open Minecraft