For right now, it’s probably best to leave them as they are.
Enhanced OPC will only help to increase the write quality at high speeds, and for some media at lower speeds. It won’t hurt to enable it, but it is not required.
Retain Book Type is an option to have the drive remember the book-type setting after eject, sort of a type of “set it and forget it” deal. Even if you don’t know what bitsetting/booktyping is, you may still set it. It’s not a requirement, but can be beneficial down the road.