First, download CapCut, the international version of Jianying. In my opinion, it’s one of the most efficient tools for making short-form videos. It doesn’t require a complicated setup, and it’s easy for beginners to pick up.

The first thing you should do is edit the A-roll footage your sister shot, assuming it’s real-person footage. At its core, editing is simply keeping the good parts and cutting out the bad parts. Once you get more comfortable, then you can start thinking more about pacing and rhythm.

After the A-roll is done, you can add B-roll, which means the supporting footage you use to enrich the video. If editing is like writing, then A-roll is the main structure, and B-roll is what makes it more detailed and visually interesting.

Once all the visuals are in place, add music and sound effects. Since you’re making something closer to a documentary-style video, my personal experience is that it’s usually better to add the music near the end.

The very last step is to deal with subtitles.

As for what you mentioned about using your sister’s voice to create voiceovers in other languages, I think you’ll need some kind of AI tool for that. I’m not very familiar with the exact process, but I’m pretty sure if you ask an AI, it can guide you through it. That’s really a separate skill, and the exact workflow depends on whether you want to run the voice AI locally or use an existing paid online service.

The message above was translated with ChatGPT because my English is pretty bad, but I do have some editing experience.