Simplification of line
When we start drawing for the first time from life or from our imagination we tend naturally to focus on details in our drawing - we need to fight this tendency.
Simplifying your line will help you save a lot of time. It also will stop you from putting way to much detail in your drawings which make it look flat and noisy.
These exercises should help:
Try drawing an object with angular straight lines and no curves.
It takes a little bit of practice to get used to this but when you get
it, it will start getting easier
Just keep at the method and have fun :)
After mastering straight lines, give this one a go :)