DOMS... thats what you are suffering from. Delayed Onset Muscle Soreness. No real cure I am afraid. Nurofen will help you...

Go to the gym tonight but don't hit the weights hard. Gentle jog or a Cycle and then 30 mins stretching will also help the recovery process.

To prevent in future make sure you warm up and down properly... and stretch, stretch and stretch some more before, during and after training.

Don't over train and once you start getting really into, look at split training. eg One day train back and bi's. The next day Chest and tris... next shoulders and legs etc.. Gives body a chance to recovery. Always lots of stretching and warming up and warming down don't forget.