Vinyl siding

So I have a basic understanding of how to install siding via watching YouTube. I had to replace one wall of a shed due to rot. Currently the wall is just OSB so I am going to put house wrap on it. After that though I’m not sure how to connect the old wood siding to the new vinyl I plan on using to cover the back wall. The corner pieces will be exposed on the old sides. Is that something I will just have to live with or do they make specialty pieces?