How do you start a car that has not been started for two years?

First, get all of the old fuel out, then put a couple gallons of new fuel in and change the fuel filter.

Change the oil and filter, substituting a can of your favorite engine cleaner for 1 quart of oil. (follow the directions on the can of cleaner)

Then, use a jump start or whatever is necessary and spray a little starting fluid as a helper tries to start the engine.

Next, put a can of high quality injector cleaner into the tank when you fill it then put some miles on it.

Don't go very far from home. It's likely to start having problems sometime during the first few thousand miles.

Change the oil after a couple hundred miles.

Good luck. Recognize that all of the rubber parts will be likely to fail soon, so be watching for engine and transmission seal failure as well as tire and other rubber part failure.