If your pump is working water will start draining back down to your sump shortly after turning on the pump.
A good controller will allow you to access and control your equipment from both locations ( Ilike the Apex neptune system).
Yes, you will have to get a bigger pump and it will use more electricity to overcome the added pipe length and elevation. A wild guess is you would use 25% more power for your return pump, but we would need a lot more infromation to give an accurate number.