How can I make my own auction template for eBay?

To create your own template you will need to be able to use some basic HTML at the very least. You will also probably want to either design some graphics for yourself or obtain some that you can use under licence. There are many tutorials online which will give you enough basic knowledge to design your own auction templates, but do try several of them because a tutorial that one person finds easy to follow might not suit you (and vice versa).