For a start, I will be stunned, with questions buzzing through my head.
Who is she? What is she? Is she OK? Where did she came from? Is she an angel?
Then I'll ask if she's allright, depending whether she looks friendly and capable of understanding our language.
If these are correct, I'll offer some clothes to her whilst avoiding giving her the false idea of me being a pervert.
Then, we'll go to the house.
I would have many questions in which I would want some answers.
"What would my family think of her and what will they say? How would they react?" would be another question that will bug me.
And from there, who knows. But judging by many manga/anime of this calibre, there might be some romantic interaction between us.
The lonely down-on-his-luck male meets a very special girl.