While I most likely can't help too much, you should at least provide some more details, e.g. about the concrete setup of your existing VMs. Especially which image formats are used, because those might need to be converted, if you have VM-snapshots available and want to migrate them as well, how your network is set up to see how that can be implemented in ESXi etc.
In general, you should create a similar thread in some VMware-specific forum, those people most likely know best about their product. But to be honest, the approach will be VERY technical in my opinion, so it might be easier for you to buy some expert doing that migration for you.