Do you want to know how to get a job at the eBay company? Or are you asking how to get started running your own auctions or open your own store on the eBay platform?
Assuming you're looking to start an auction business on eBay and are not simply looking to get hired by the eBay company: there's no point in us here duplicating information that's already widely available elsewhere. Ebay themselves have a number of excellent tutorials to get you started, and there are many other websites with a wealth of information for new eBayers. Just Google something like "how to get started on eBay" and you'll find tons of information.