Lots of help on the dedicated forum https://forum.freecadweb.org/viewfor...c1c8839193ee32 . This topic in particular will be of interest https://forum.freecadweb.org/viewtopic.php?f=15&t=25595 .

In short,you need to select the body then click on the icon that creates a path job object.It helps if in preferences you select job preferences and set them accordingly.You will have to create the tools you intend to use and create a controller for each of them.Select the machining strategy you intend to use and select the surfaces,set the parameters to suit and then the toolpath should appear.