Ўзбекча

I would like someone to correct the sentenses below if any.Thank you on beforehand.

1.Your idea is not bad.
=>Сизнинг фикрингиз ёмон эмас

2.Our university is in Tokyo.
=>Бизнинг университетимиз Токиода.

=>Токиода бор бизнинг университетимиз. It sound unnaturally.  

3.Where does your father work?
=>Сенинг отанг каерда ишлайди? 

4.My father works in a post office.
=>Меним отам почтада ишлайди. 

5.Isn't she a Rustam's younger sister's friend?
=>У Рустамнинг сингилининг ўртоғи эмасми?

6.Our town is really beautiful.
=>Бизнинг шаҳримиз жуда чиройли.

I haven't uzbek keyboard, so I can't write uzbek specific words.