You can't. You need to get fertile eggs from a reputable supplier of such, who breeds chooks. You either need a good reliable incubator or a broody hen.
Uncle Bill C. Now retired on an 8 acre retired block in NZ. I have 7 hens; Wyandottes and Brown Shavers. The shavers are Rescue battery hens. All are about 3 years old. Had a few more but one got taken by a hawk and another just dropped dead the other day. They are free range and put themselves...