@arilies0 it's probably best to ask this on the E3D tool changer forum, although it's down at present. However, I suggest you concentrate on getting homing working properly before trying to do tool changes.
You may find my config files at https://github.com/Duet3D/RRF-machine-config-files/tree/master/E3D_Tool_Changer/dc42-wifi-centreZero-quadTitan useful, but bear in mind that these set the X0 Y0 origin at bed centre.