Vue isn't a modelling tool. 

The simplest  and easiest way is buy or use dedicated Vue models from freestuff that match the scene you want to make. If you have poser you can export models into  Vue.

Lets take your example. Theres a few medival models for vue and poser in the freestuff here.

Dark anvil has a commerical wharf and other buildings which work really well. For the french tavern and streets try RuntimeDNA. Faveral at daz has some nice ones as well. 

Theres loads of WW2 german products and freestuff at vanishing point. 

Not sure where you'd find the U-boat though. Theres a modern one in daz freestuff.  
 

Pinky - you left the lens cap of your mind on again.