So first, here is a list of what you need:
-A plastic sandwich bag
-Somewhere cold, like a fridge.
So first, eat the apples! Get the seeds from the apples. We have an apple cutter so I just cut it and gently cut the core in half(so I wouldn't damage the seeds) and took the seeds out.
Wash the seeds. You will need to do this to wash off any apple remains, as they will make the seeds rot.
Now, get a paper towel, or napkins. Stick it under the faucet for a bit so it gets damp. Make sure its all wet, and then squeeze as much water out as you can. Stick the seeds on the napkin, and then fold it up.
And then put it inside of a sandwich bag. Stick it somewhere in the fridge and leave it there for a month or two. Apple seeds need a period of cold. During the fall, apples that fell on the ground will decay, and then when they do, the apple seeds are in there. They are left there through winter, and then they start to sprout in the spring. This is why you need to put the seeds in the fridge, they are sort of programmed to only germinate after a period of cold.
Make sure to occasionally check the bag to make sure the napkin is still moist, if not, add a bit of water to it and stick it back in.
After a month, I checked my seeds and they all sprouted! But if they haven't sprouted within the two month stratification, take them out and moisten the paper towel, and then place the bag on a windowsill(or wherever it will get good sunlight) and blow some air into it so it creates a mini-green house.
Leave them in the bag until they sprout. They should start sprouting at around two weeks. After a month and a half, if they all have not sprouted, the ones that haven't probably never will. You can pitch them if you wish.