if they are installed correctly they will load like any other wii game.
Now when you load recalbox in wii your wads will appear. However you may have to make the partition writable as it might say read-only, in this case i use winSCP and the command mount -o remount,rw / i then reload filezilla and edit the file, there are better ways to do that. wad extension in the wii dolphin emulator section. Using an ftp client like filezilla locate es_systems.cfg and add. Test the game by double clicking on the rom, if it loads you are good to go, install and test a few more, bit hit and miss with them. You'll need a keyboard attached and mouse for ease, but right click on the wad file that appears in the games list and click install, might not seem as if anything has happened but the wads are really small and install quick.
Next from recalbox select nintendo wii, load one of your normal wii games either iso or wbfs, using the hot keys select and right trigger (might be different on other setups) you will exit the game and reach the emulator frontend for dolphin, from here you can go to settings and set a path for your virtual nand, you can also set the path for your wii games to make the next part easier. Obtain wiiware wads, copy these to the same folder as the wii roms. Although some games are hit and miss, this is how to make wiiware roms work on PC hardware.
By default emulationstation loads wbfs or iso for wii games.