congrats! i had my cat at fully grown so i cant advise on raising a young one, but as for getting them used to you and your house i just left her to it.
the first night a had her she looked around the whole house first, as its quite big i followed her around a bit, then we both got on the sofa and all seemed ok, so i nipped to the shops for a stock up of food etc, when i got back there was no trace of her!
i called my brother over who only lived next door at the time (weird i know) and we turned the house upside down! no cat! i convinced myself she must have got out the door when i left to go shopping, and eventually went to bed. after laying awake for ages i dropped off only to be woken by somthing walking about on my bed? but i dropped off again.
next morning, no sign of a cat and i wondered if i dreamt it? that night same thing again. but after a week she was just like part of the furniture.
so my advice is, just give them time, everyone i know says they hide at first, but they will soon come round to love you im sure!