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well first your pictures kind of have “holes” the first picture is from a different modeling program but the other 2 are using blender. whats the first one called ?
also welcome to the community
The first one looks like Wings3D which is a pretty good free 3D Modelling program. Although it doesn’t have as many features as Blender it’s still worth trying.
Welcome to the community 
Hello and welcome to the Unity Comminity. Enjoy your stay.
Nice models, welcome.
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So you want advice on how to program a starship?
You’ll probably want to add thrust (force) where the thrusters are on the ship. That’s assuming you want realistic physics. If you want space-braking and all kinds of scifi stuff, you’ll have to think a lot about how you want your ships to work, and there’s a lot more programming.