That's a terrible idea. In addition to what ChloeCat said, you don't even know what contacts are proper for you. The only way to find out is to go to a doctor.
Why do you wanna buy contact lens on an online site?
Go get your eyes checked and then get contact lens from a real doctor.
Don't just do it online, it might harm you.
eyesight is one of your most valuable senses. Don't know why you would want to jeopardize your sight for lenses that you have no idea where there coming from.
OK, Just a little pinprick-There'll be no more-ah!