MM2 City Toolkit program, as the same says, it's a program that allows to create new cities for MM2, not cars, but also in this case isn't something easy and are always needed other programs.
You
must try to learn by yourself how use any tool developed for games editing by reading the tutorials that usually come with them.
Here's it,
here the downloadable version and
here the sample city.
About making cars, what's available to learn in this is
this very good tutorial (again, do a quick forum searching no?).
If you aren't able to learn all this for any reason, means that's not for you and that you have to give up with this, and it's normal anyway, not everyone are able and also need to learn these things.
And please, now stop to post useless spamming posts with only smileys, if you'll post more, you'll get suddenly banned! Don't be such annoying, because asking in the forum in the correct way you always get the reply and the help that everyone's able to give you... Doing that you only show a behavior that probably neither you want to show in a forum, and with it, people will give a bad look to you.