1996 Honda Accord oil in spark plugs and white smoke from e

Engine Mechanical problem
1996 Honda Accord 4 cyl Automatic

I bought a 96 honda accord lx a few months go. It was working well when we brought it home. I havnt driven it since I got it. Yesterday we put a new battery and did an oil change and we changed the oil filter and air filter aswell. We also changed the spark plugs but when we were changing them we noticed that they were flooded with oil. We changed them anyways and when we finished we turned on the car and we hear a cranking sound and I noticd white smoke coming out of the exhaust pipe. We turned it off and then on again. It did the same but this time my dad pressed the gas pedal and clear liquid started coming out of the exhaust pipe. It didnt do that before. What do you think it is? And how much do you think it will cost to fix it?