First thing I would do is go to Walmart and buy a few value packs of #7 1/2 birdshot and "get to know the gun".
Second, I don't "clear my house". If I know someone;s in my house, I set up a defensive position and call 911. (I let the professionals do it, that's why I pay taxes.)
The only things I consider to be "must haves" on my HD shotgun are a source for extra shells and a mounted light.