first,I have to say you understand the word "you"and "meiyou" correctly.
but there is something wrong in your passage."car"is "qiche"but not "chiche".
we use "you"to mean we have something .for example"I have a cute cat"means"wo you yizhi ke ai de mao".but in Chinese we say "you shihou "mean "sometimes",here "you"dont mean "have"
and "meiyou"means we dont have something like"wo meiyou qian"means"I dont have money",sometimes,"meiyou"also to express something didn't happen,like
"ni jintian qu xuexiao le ma(did u go to school)?"
"meiyou.(no,I didn't)"----here we also can say"bu,wo meiyou qu "
"bu"is to express negative .