I bought a new house and requested the builders' electrician to install the EV charger but he said he has ever install one. Hence, he simply installed a 40amp breaker with a 3 pin standard outlet plug and gone.HD has them for sure, very common, same as your range stove. Just ask someone in the store. And yes, you need a 14-50R as that is what is needed for the 14-50P plugs used by the L2 EVSEs.
If you know nothing about electricity, then for sure, get an electrician to install it for you. They can likely source it for you, too.