Urgent need of Help for modding Purpose.....!!

hie everybody, just like you guyz i like to mod the movies too, its just am awsome game to chill out with. i had tried with backdrops and sounds but i am unable to properly transfer an outside 3d model as a static prop in the game:( i know everybody things that this is one of the easiest thing to do with modding but i m kindof lost in here.....!! cant find a decent tutorial too anywhere in the net, i am a huge fan of SexyMaria's modds but the tutorial was not very good.....!!

Please help i m currently making a huge star wars project n i need some third party models in the game......!! please help

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thankz in advance.....!!