I think the pit is supposed to be left whole, not split. You put it in a baggie with some water first, then when you see a little root start to grow, plant it in very moist soil.
Be patient. Every step of planting a fruit tree from seed might take months and then it can take 5 to 15 years for your fruit tree to bear fruit. Be aware of these timetables going into this and decide if you want to make this commitment.
Don’t expect the fruit from your fruit tree to taste like something from the grocery store. It will likely be worse because it has characteristics from its “mother” and “father.” This is why fruit trees today are grafted—it guarantees the tree will only give good fruit.