iCal problems

Not sure if they started after I upgraded to Lion or before since I don't use it much. When I went to add an event and opened up iCal, it gives me a choice of home or work but not matter what I choose, the choice keeps coming up and you can't do anything. The only way to quit iCal is to force close it. It was also filling the calendar up with events that came in any e-mail, though I think I've fixed that problem. Any suggestions on how or what I can do to fix iCal so it works properly. Just remember I am relatively new to Apple products so I need simple step by step directions.