Let’s be honest no one enjoys wasting time drawing out builds when they’re ready to build!
This is a method I personally use when building, I hope you find this helpful as it helps me design my builds. I will provide examples of this below.
First, it is important to crate a general shape of what the build will be, this really depends on what you’re building but for example lets use a hallway. 
Here you see how I made a basic shape behind the detailed design, I always add a plain template to add detail onto when doing walls.
When building hallways I tend to start with one side of the wall and make the pillars first or the object that will stand out the most, as shown in the image above.
Once I have made a finished detailed wall I will move onto the roof, same as the wall I will make a general shape of what I want the roof to look like then add detail.
Once the roof is done I will move onto the other side of the wall, this is where you need to start thinking of the environment of where the build will be based for this project I added a window on the otherside to show that its based in a space station etc.
Here is the finished project! 