Upgrade CM12.1 to CM13

Hi, I am new to Android upgrade. I know only OTA upgrade in phone. Can any one please explain me step by step instructions to upgrade my Storm. It keeps saying Google apps stopped working, and many other error with google. Now I am unable to use settings -> Apps . As soon as I open chrome or settings->apps it says stopped working. So, I made my mind to upgrade to any stable version if any updated. I have found that there is CM13 available. But, do not know what has to be done. As some where I read to install kernal / TWRP / image ,etc. But, I am really not Android Savy and do not know all these terms or exactly what I should do and what I have to do. Please Please give me step by step complete instruction what I have to download and how I can update my Storm with CM13. One more question is CM13 and Android 6.0 "Marshmallow" both same? This might be very dump question.

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