Venga a nuestra casa is used for someone who should respect or who is elderly so this would be the right choice.
Ven a nuestra casa would be used to refer to maybe your close friends or people you can be casual with :)
Lo should be in the blank because it is el pollo el-> lo
Howdy!
I believe you would need to switch out the 'o' in "Hablo" and trade it for an 'e'.
Therefore changing "Hablo" to "Hable."
Hope this answer helped! :3
Cheers, mate!