I hope you removed the master cylinder cap before you forced the calipers in. If not, you're not going to be stopping the car any time soon.
Like Iroc said, a few pumps before moving the car will prevent any scary stuff.
Secondly, you'll likely hear some squealing when you apply the brake pedal. That would be normal. If you installed the pads with anti-squeal on the back of the pad, then you'll be fine once the pads settle in.
Also, I hope you checked the rotors. Typically these cars need rotors with every pad change. In the future, I suggest finding someone who offers lifetime rotors and pads- like O'Reilleys. I change rotors with every pad change.