What do you mean writing with gustar?
In my opinion abran would be better but the rest are good words too because its saying open your gifts everyone and its makes more sense then saying den (give) or da
I think it might be estoy
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 :)
