I'm very new to the world of bicycles, and I'm making my own e-bike. The only part I can't figure out is how I should connect the chain drive from the motor to the rear wheel. If I attach the chain to the existing freewheel on the DS of the rear wheel, I will have two problems. The first is that my pedals would continuously spin at the same rate the motor is turning. Someone suggested that I try to equip a shimano front freewheel system, but that still leaves another problem. When I pedal, the motor is still attached to the rear freewheel, making it so my pedaling is actually turning the motor as well. That obviously creates a lot of resistance. How do they accomplish this in e-bike kits? There must be a way to do it. Maybe I could even try to attach the chain to the front wheel instead? Thanks for the help.

Not certain that I understand your problem, but
1) Purchase a front hub motor and don't worry about whatever type of rear gears that you have.
2) Rear hub motors have either a cassette or freewheel so when you pedal, you assist the motor, or the motor can operate and you don't need to pedal.

Really? Maybe you should just go with a hub motor front or rear, like 2old suggested...

Sure there's a way to do it, just look at the add-on motors out there that have 2 chains and a free-wheel spocket inbetween.

Good luck.