In my group, it was decided that I was going to find the sound effects for the video. This included finding sound effects that contained sounds of animals on a farm, natural ambience, a sci-fi whoosh effect, keyboard typing noises, retro video game sounds and more.
For these I researched different websites for free, copyright free, downloadable sound effects. For these I got them from a few different places.
Mixkit
My personal favourite site was called mixkit and had a wide variety of sound effects that you could download for free. Mixkit has sound effects for different headings such as transitions, nature, technology, animals and games. Below are examples of how many sound effects Mixkit has to download.
I mainly used the game section of sound effects as my group needed retro sounding opening sound effects for the video. I also found some transition swoosh sound effects, keyboard typing sound effects and animal noises.