I have a Electra townie step through bike that I would like to convert into an bike. I am wondering what parts do I need, what would be the best motor for my bike, hub mounted or pedal frame type (sorry don’t know te technical name for it lol). My bike has the typical caliper brakes, will I need disc brakes? What am I looking at cost wise?

I want to add the motor to make it easier to go up hills and cycle in strong winds. I would like a battery that can last and I am wondering is there a system that recharges itself as you ride?

Thanks to everyone in advance :)