Please be more clear...
Do you want to code other peoples websites?
(making a website for some company)
Or do you want something like an ecommerece(wow i spelled that wrong) website?
(you have a website with a paied game or something to buy on it.)
If you want to make websites for other people, Ide start by making one of your own to mess around with and then when you do want your first job to first go to family/friends. A great way to start is to ask your church or school if they would like a website.
If you want the second option, well if you do im not going to write it now because it will take a bit more explaining.