you would say это мой дом it doesn't matter if you're boy or a girl, as house - дом is masculine. Whether you use мне or меня depends on the case, what you are trying to say http://ru.wiktionary.org/wiki/%D1%8F

You use and to list things: I have beer and cola in my fridge. You use or, for marking the difference: Do you want beer, or cola? As in "you can't have both" Do you want to go to the beach or museum? Do you want to go to beach and have a swim?

Freak out - got upset hang out - spend time together hands up - raise your hand, like when you're volunteering for something

sometimes also called carbon footprint, is basically how much waste humanity produces in relation to what earth can provide us back. the lesser, the better.

Piece of Cake can mean easy to understand, but it can also mean easy to accomplish.

other option is to drop used to: "I finished my work before night today" as in I usually finish after dark, but today, I got to finish it sooner.

plus this is german word, you know it will not have ordinary everyday meaning if it's borrowed from another language.

that's good enough, you can go with "Forget about you"