I am assuming you want to list with variations, if so this is what you do.
When you start your listing after selecting your category a box will come up asking if you want to list with variations. Click yes.
click add your own variations
A box will appear - add the name of your option - example - Shoe Size
Underneath this box type your other option - example - 7
Press the + sign to add further options, then click continue.
Click all details as required to the rest of the listing
another box will come up asking you to create variation - I just press - create variations box & continue
You can add individual pics and prices as required.
I hope this helps.
Shout if you need help