Easy and quick way to recieve money when selling things online? how do i do it?

[Mollie]

okay im 14 and have started handmaking bracelets and necklaces, many designs etc, have sold a few to friends at school but not much has really come of it..was wondering whether there was any way i could see them on the internet? i know there is ebay an amazon and stuff but im only 14, so is there any legal way to do this? if i was to advertise on a website or start my own website, (how much does starting a website cost and is it legal for me to do so?) and how would i recieve the money? if i advertised it on twitter, possibly sending to people i dont know who follow me, how would i recieve the money? many thanks also any cheap gift ideas for my boyfriend for valentines day and his birthday would be very helpul!