ran out of gas and it wont start

I have a 2005 Kia Optima LX and I ran out of gas on the side of the highway I've in had someone bring me some gas so I thought that was the problem it wouldn't start so then it acted like the battery and I went out and bought a brand new battery and put it in it that helped but it still won't start.I put more gas in it and two quarts of oil and it just had.the plugs changed on the car to work better. this is the first time I have ever let it run completely out of gas and I had bought the car off of a girl who was very young and I don't no how is she ran it or how many times she let it run out of gas can you please help me I don't know what to do.