How can I tell her I like her and maybe give her a kiss tommorrow when were at her house?

Well she seems really comfortable with you coming over soo maybe it will be easy and come naturally. You dont want to plan this out lol but I know thats not what you are trying to do, you are just really nervous. So to tell her how you feel, you could do it in a cutish way. If you guys are really flirting, maybe ask to play 20 questions and ask if she likes anyone. If she gets all nervous and doesnt answer then you say how you like a girl whose name starts with the letter ____ (letter of her name haha). Then she should do the same in return. But as for the kissing, maybe leave it for when you say goodbye.. Im not sure, you will know when you are there :) Worse comes to worse, she might turn her head and you kiss her on her cheek. But if goes well you will probably get a kiss lol.