If you are desparate and this is the only wheel you have access to, then it is likel that you can make this wheel rideable again, but it will likely never be perfect.

Bend it back into shape and start searching for a new wheel. An LBS can get you a wheel with a single wall alloy rim for $50 - $70 or so (depending on the type of hub), or you can troll garage sales and look for a doner bike with similar wheels.