Auto caption for Training feature

I'm a photographer and have been wanting to train a model on my own work, I have over 15 years of archives to use for this. I'm unable to run Auto1111 on my machine due to work restrictions, and have been having a really hard time trying to find a resource to auto-caption 1000 images.

I tried to run a training without captions and it failed, not sure if that was the reason. I know the auto-captions arent the best, but I also can't see myself having the time or focus to caption 1000 images manually.