You need to start with dry chickpeas, do not use canned chickpeas here. You will need to begin soaking the chickpeas overnight, allow up to 24 hours.
When you fry the falafel patties, you want to achieve a deep golden brown color on the outside. More importantly, the patties need to be fully done on the inside. Your frying oil needs to be at 375 degrees F, for my stove, that was at a medium-high temp. Be sure to test your first batch and adjust the frying time as needed.
If you prefer, you can bake the falafel patties in a 350 degree F heated oven for about 15-20 minutes, turning them over midway through. Use a lightly oiled sheet pan, and you might like to give the patties a quick brush of extra virgin olive oil before baking.
To make ahead and freeze, prepare the falafel mixture and divide into patties (up to step #6). Place the patties on a baking sheet lined with parchment paper and freeze. When they harden, you can transfer the falafel patties into a freezer bag. They will keep well in the freezer for a month or so. You can fry or bake them from frozen.