Sprint Planning input/output

Hi to all,

Can anyone suggest me please what is the mandatory artifacts and other "things" to start Sprint Planning and to finish the Sprint Planning?

In my mind there is no input (even if you don't have items to take to the SB you need to refine it at event) and 2 outputs: Sprint Goal and at least 1-2 items in SB. But what about for example the Product Goal? 

Thanks in advance!