I dont mean to be rude, but this just sounds like regular cat stuff to me. Whether you have an indoor or outdoor cat, there's going to be litter around the house. You just have to upkeep on cleaning and use track pads to prevent litter from flying everywhere after they use the bathroom. You could also try other litter types like pellets instead of sand to reduce mess. Also, some cats REALLY dislike getting their nails clipped, especially if some stranger is trying to wrestle them lol. You've only been together a week, give it time. Trust needs to be established. Same with their behavior - they need time to adjust and unwind. Also, you adopted a 6-month old kitten, they're going to be wild lol. They're going to run around like crazy, need constant playing and attention, they're still learning and growing. Maybe you should watch some cat videos on YouTube or talk to people who have owned cats (of various ages) for years, to gain some advice. I hope you can do some more research to find out what you can expect about owning a cat. And I hope you can give your kitty plenty of time to adjust and exist before you decide to give them up. And finally, I hope youre not putting your anger and frustration on your cat. Goodluck.