How would i make sure that my pigeon eggs hatch successfully?

Doing what your doing now will not work sadly. What you need is to get a heating pad or a heating lamp. For a heating pad, you need to make a makeshift nest and place the egg so it is facing up. Turn the heating pad on LOW. You must turn the egg every hour. Also the yolk coming out means it is dead. The incubation of the egg is 14 - 18 days. Now for a heating lamp, get something similar to like a small can and make a makeshift nest. Don't put the lamp really close just enough so the egg is warm. You will have to check the temperature for the first 10 minutes to be sure it doesn't boil or overheat. Good luck!