You can directly access the mainsail in OrcaSlicer. You can start a print or other things with this feature of OrcaSlicer.
You can follow the steps in the video below to access Mainsail within OrcaSlicer.
After slicing the model in Orca Slicer, there is no difficulty in sending it to USB or saving it as gcode and starting it, like classical slicers. After connecting your printer with your IP address, you can start your print and control your printer in OrcaSlicer.