First of all, being creative in your mind doesn't mean you can express it well, so I suggest learning furniture design software. CAD and 3dmax are the most commonly used softwares for furniture design. Find any software training class 1 or 2 months. The software that furniture design needs to master is mainly cad. Two dimensions are used to draw three views of furniture, and three dimensions are used to draw three-dimensional pictures of furniture. Then, you can import the prepared 3D drawings into 3D to create renderings. Of course, 3D can also be used to make furniture models. Finally, PHOTOSHOP is used to modify the renderings. Finally, submit a furniture design drawing (three views with furniture size) and furniture effect drawing.
Secondly, we should pay attention to some standardized drawing expression methods of furniture design. I suggest you buy a workbook attached to Interior Decoration Engineering Drawing published by China Light Industry Press, and a Furniture Drawing also published by China Light Industry Press. Northeast Forestry University Press also has Furniture Research, which is a good book for studying furniture design. The first comparison foundation focuses on drawing, and the last two are extensions.
Finally, you should pay more attention to the websites of furniture design, look at the design thinking of furniture designers and the classic trends of furniture design in the world, and improve your artistic accomplishment in furniture design.