If you are planning on doing some storm cleanup, think about semi-chisel chain - it holds up better in the dirty wood and when (not 'if') you hit unexpected stuff. Have several extra loops and a way to sharpen without a 110V grinder (files, 12V grinder, etc.) unless you have a generator.
The comments on extra bar oil are good - it can get scarce quick. Also good to have the small repair/maintenance parts (sprockets, drums, 'e-clips, spark plugs, bar nuts, etc.), an extra bar or two, and a few basic tools. These are basic things that you will probably need eventually, anyway, and can shut you down if you can't get them. They may be gone from your dealer's shelves for a week or 2, and may be week away by mail order.
If you have not done storm clean up work before search some of threads here on A.S. and on reputable sites (STIHL, OSHA, etc.). Tangled trees are often under extreme tension and bent over trees can stand back up with surprising speed and force.
Take good care of yourself. Don't work alone. Get rest. Bring food and water. Have a car charger for your cell phone in case you need to call for help. 2-way radios (CB or Ham) work when the phone lines are down. Not a time to scrimp on PPE (the news coverage always shows a guy with cut-offs and a Wild Thing cleaning up).
Assume power lines are live, unless you can see 2 ends or the power guy tells you personally that you are OK. People sometimes hook up generators creatively and back-feed these.
Preparing your home is a whole 'nother thread.
Philbert