Won't start when engine is cold,

possible frozen gas line from the tank to the engine disconnect and see if gas flows freely
otherwise try to warm the vehicle up in a garage or use a hair dryer to gently heat engine area at fuel intake.

consider adding some fuel additive to dry out possible water in fuel tank and make sure tank is not very very low if so add fuel.

Sometimes you can plug in a space heater and heat the engine area being careful not to set fire

It varies by make. Remember most transmission fluid is locked into the torque converter and didn't come out even when you changed the filter. So knowing the capacity isn't helpful. Filling from a filter change usually doesn't take much fluid. Maybe 3-5 quarts. Just add fluid one quart at a time with the engine off. Start the engine with the transmission in neutral and check fluid level. Repeat this process until it reaches the cold full mark. Then start the engine and let it warm to operating temperature. Check the fluid level again, it should now be on the hot mark. If it's not add some more until it is. Remember all checks should be done with the engine running and transmission in neutral but you should only add fluid with the engine off for safety reasons.

Could be a loss of fuel pressure after sitting. The check valve in the pump could be faulty.

Do you have normal fuel pressure when you first crank it ?

There is a door in your air intake that is thermoststicly controlled
that is to remain partially closed until tge engine warms up.Thereby letting in cold air on a cold engine, causing it to run rough.

Metal shrinkes when it's that cold causing this,will have to just do what it takes to keep going.

The next time it won't start check the fuel pressure you should have 48-55 psi with key on and engine off.

YOU PROBABLY HAVE BAD SPARK PLUGS AND WIRES.YOU NEED TO CLEAN FUEL INJECTORS AND CHANGE FUEL FILTER.THIS LITTLE TUNE UP SHOULD HELP.ANY TIME YOU SPRAY ETHER DOWN AIR INTAKE TO GET ENGINE STARTED YOUR ENGINE NOT GETTING ENOUGH FUEL OR SPARK TO COLD START.YOU NEED RICH FUEL MIXTURE ON COLD ENGINE START UP.AS ENGINE WARMS UP FUEL MIXTURE HAS TO BE LEAN.

could be a vacume leak. check hose for cracks or lose conections.