You would start by not asking how to and go out somewhere and try. Dress to impress, and you'll grab attention.
How can I get a boyfriend?
Getting a boyfriend... Sounds a bit hard! I guess you need to for that first make friends with a boy and then try to understand him and then judge if he's the right guy for you or not and then ask him if he could be your boy friend or not! But honestly I guess you should just wait n enjoy your life! When you will fall in love with sow one then, he will simply be your boyfriend so just have patience and enjoy your life!