Hello, I've read your description carefully, and I understand that this will need only some basic knowledge of editing using Adobe Premiere Pro, I have tons of similar experiences, for the captions part, we can make it closed or open, it's up to you (subtitles merged to the clip or not) also I suggest to record the VoiceOver First, so at least we can synchronize everything together in proper way.
Please contact me for further details. I'm available to discuss all the details.
Looking forward.