You will probably blow the motor. All you need to do is drain the oil/antifreeze mix by removing the oil drain plug, and put new oil in it. I would also replace the oil filter.
NO! DO NOT EVEN START IT! I take it then that you do not have the means to climb under the car and drain the oil? If not, you must have the car towed to a shop tell them what you did. As long as the car is not started, once that mix is removed from the pan and fresh oil added, the car will be fine. I would however change the oil again after 100 miles or so. Then change it again after another 1500 miles. After that you could go back to your regular schedule. Good luck!
Don't even start the car. It needs to be drained and refilled with oil and change the oil filter. Starting it with antifreeze in the system could ruin your engine.
you really dont want to run it at all. the best thing would be to drain the oil then flush out the engine with more oil untill all the antifreeze is gone then fill it back up with oil. and dont froget to change the filter