I ran out of gas and now my car wont start. Tried turning the key several time and no luck

Once the system has air in the lines you may have to cycle the key on and off several times to get fuel back up to the injectors.

ran out of gas while it was warming up , I put gas back in it and turned the key a few time still wont start up

If high miles, it may be a fuel pump. Fuel pumps usually go when gasoline is low and pump gets too warm. This may mimic running out of gas when there is a gallon or two of gas still left to draw but needle reads empty. Have someone put their ear to the gas tank while you turn on the ignition switch. the pump should run for 2-10 seconds with key on and not cranking.

If you don't hear the pump run, then investigate further for a failed pump.

Take off the smaller wire off the starter motor. Put the key in the start position and hold it there for a few seconds. Listen for the fuel pump running. If you hear it running then it feels like it stopped, then let go of the key and reinstall that wire on the starter motor. It should start.

No ressting to do. You need to remove all air from the fuel lines. Running out of gas in any fuel injected vehicle is a big no no for it is so expensive to get back running right. Add 5 gallons of fuel to get good priming pressure first of all
Turn the ignition key on for 5 secondes and turn it off for ten secocds. Do this step 5 time to bring up fuel pressure to the engine
Next try and start it
If it does not start release the air pressurized in the fuel line at the fuel rail above the engine. It looks like a tire air fill valve. Use a rag to catch the gas that spews out as you bleed the air out
Now turn the igition key on and off again for 5 times as stated above and proceed to start the engine once more
Good luck

This may be a fuel injected engine. On some vechicles when they run out of gas you have to turn the key, but not try to start the car. Give it a few seconds for the gas to feed back through the gas line. Once you turn the key, the fuel pump will start pumping the gas to the engine for the carburator. If that does not work, then give it a little gas, no too much or you could flood the carburator. Try to start the car again.

hit the key five times without trying to start, just bump the starter, after the fith time turn it over and it should crank

If you ran out of gas, then you will need to perform the following. Turn the key to the on position (do not start). Turn key off. Repeat the process a few more times. Also, have someone help you, for when you turn the key to on, you should be able to hear the fuel pump hum. After a few times, try starting the vehicle. Air has gotten trapped in the fuel injectors. By turning the key a few times, it primes the injectors. If it still will not start, or you cannot hear the fuel pump, then have it checked out. Hope that works. Let me know.

It's a Dodge, what more do you want?

it could be the fuel pump