As others have mentioned, I too run a VFD around my workshop and run multiple machines off one drive (220V single in, 220V 3-phase out). A neat connector I utilise is the generator plug/socket combo as depicted below. I also use the original on-off switches situated on my two Pullmax's to operate the machines, and have suffered no adverse effects from not using the start/stop controls located on the drive to do this.
Get the VFD with the highest output your wallet can handle, or at least one that has an output matched to your biggest motor. Also preferably a VFD with a built in potentiometer which will allow you to manually vary motor speed on the fly. Most, if not all manufacturers support the retro-fitting of a potentiometer, so not having a built in one shouldn't be a deal breaker, but will need some elementary electronics knowledge.
Lastly, you should only run your motors in delta connection as someone else has previously stated.
Best of luck!