You don't need any of that stuff, Dolphin can just load homebrew DOL and ELF files from the "Open" menu. It's really that simple. Although note that if you want to have an SD card (e.g. want to use homebrew that requires access to external files) you will need to create an SD card "image" and point Dolphin to it. There are probably various pieces of software available to do this.
Although I would have to wonder why you'd want to bother using Dolphin to load homebrew. Most Wii homebrew only really makes sense on a Wii. For all apps and emulators, there are better PC equivalents. There aren't really a huge number of stand out homebrew games.
Anyway, whatever your reasons, as I said, you can just load them from the "Open" menu of Dolphin :)