Need Help With Physics

I am new to this program and have been messing around with the physics of the default character to get an idea of what I need to do to add the correct physics to my character. The issue I am currently having is that when I simulate my character, after manually applying the bone structure to my character, he falls down and pieces fly everywhere. I apologize if this is in the wrong section of your forum, but I could use a little assistance if anybody could help me with my issue. Thank you

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