So I made a few Models that I thought looked nice but when I export them they come out with 0 MB's Etc. And I cant use em' in game and its very frustrating to work on a project for hours and not be able to use can anyone help?

When a model is 0 MB in size after exporting, that means an error occured while exporting.

 

The most common error is two objects having the same name. Try and export the model again and keep an eye while exporting on the message bar in the bottom of your screen. If you get a red arrow, take a screenshot of that and post it here so we can better know what the problem is.

and make sure your exporting whatever the name of the car is, if its police.wft then you export police.wft. You can't export noose.wft if the car is named police2.wft, just look at the top of the hiearchy for the name and like Tunes said, you need to look at the bottom because most likely you have duplicates of something