I will start this off...
What did you run into on the drivers side?
The good news: you do not have to do anything and your car will still run, it will however leave puddles on your drive and wobble around the road.
You should:
Do an oil change, the new oil filter comes with the gasket for the filter housing. Or just buy an oil filter and replace the gasket, read this thread:
http://www.e90post.com/forums/showthread.php?t=575295
The control arms should be replaced in pairs, read here, one of my posts includes a video:
http://www.e90post.com/forums/showthread.php?t=574880
Parts:
http://www.trademotion.com/partlocat...layCatalogid=0