In this you can download the exact file structure that I use for all my videos.

I keep one of these saved as "Video Template" and duplicate it each time I start a new video.

For most this may seem overkill and it is for what you need but as you start making videos with more files you'll find having them all in one folder mixed with your project and exports can make it really hard to find your files. Once you get used to this file structure it will allow you to organise them