I don’t know how to organize the project pane efficiently. Right now I have audio, textures, scripts, etc. separated, but they’re going to get filled up quickly. What is an efficient way to organize the project pane?
I organize my assets based on the frequency of their use (are they used for only one scene or more than once?), their classifications (Prefabs, Textures/Materials, Audio/Video, Models/Animations, Fonts, Scenes, Scripts, etc.) and any other conditional necessities (structs, enums and utility classes inside the Standard Assets folder, editor classes inside the Editor folder, etc.).
But the most efficient way to organize your assets is the way where you’re most comfortable in accessing them whenever you need to. Needless to say, only you can figure that out. 
Hello!!
In general we, open a new project and import any Unity Technologies package and the only folder organization enforced is an ‘Assets’ folder with a subfolder of ‘Standard Assets’. What about our custom assets?
Here is the SOLUTION. What Unity Folder Structure Do You Use? - http://bit.ly/1b7cLyq
-Sam!