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In film spaces, we talk a lot about cameras, lighting, and editing, among other things. However, we don't often discuss the craftsmanship that goes into creating everything you see on screen, that being props, costumes, and production design.
The art department is a very broad department that includes storyboarders, set dressers, and prop masters, among other roles. They are most responsible for the "look" of the film.
Film school doesn't really teach you how to do production design. Sure, you'll probably learn a bit about mise-en-scĆØne (put simply, everything you can see on screen), but you won't learn much about how to make props or dress sets. However, the "look" of a film is very important, especially on student and indie projects. Good production design tells the audience one thing: this is a real, professional film.
As someone who's been the main production designer on several student shorts, here's some advice on how to give your films that "professional" look.
Getting Started
If you've produced a film before, you're probably familiar with the breakdown script. This is a version of the script that highlights important aspects like actors and lighting. It will also highlight all necessary aspects of the production design.
Student and indie projects usually don't have as much money as studio projects, so a production designer for these projects will need to be creative, adaptable, and an out-of-the-box thinker.
When creating the "look" of your film, be thorough. Decoration can tell a lot about the character who lives in a space and insert shots of props can help a film feel more professional.
Acquiring Props and Costumes
The first place you should search for props is in your own storage. Ask yourself "do I have any items that fit into the film?"
Another great place to start looking for props and costumes is the thrift store. While items are not consistent, they are often unique. After the thrift store, I would recommend looking for props in cheap places first. This way you find what you need and save your money for the most important items.

Prop and Costume Creation
Often you'll need to create the props yourself. Any skill that you may have learned in an art or home economics class will come in handy here. If you know how to sew or sculpt, this is a great job for you! Again, search your storage and thrift stores for supplies. Anything could come in handy.

If you don't know how to make something, there's no shame in looking it up on the internet. YouTube exists for a reason!

Why get into production design?
Other than the already stated benefits of good production design, you might still be wondering why you specifically should try to make your own props.
I've found that working has not only given me a different perspective on filmmaking, but it has also elevated my ability to work in other roles on set. Being talented in multiple different types of arts allows you to cross your skills. For example, I enjoy creating collages in my free time. The skills associated with creating collages include creating interesting shapes and colors, which allows me to better understand how to use shapes and colors in my work.
If you're interested in giving production design a shot, I recommend trying out some classic arts and crafts. Get creative with it!