how do i send items to the customers if i have a online store?

im wanting to start a online store but im needing a little help if you know of some online companies or web designers or even places where the customers can buy from me but they pay for their own shipping and handling on when it get to them. if you know how to do so please let me know thanks,

I am a web designer. But If I say this it will be an advertisement. But sure I can help you. You can mail me.