Creating Schedule of Imported Posts to Twitter


I apologise if this is a bit of a basic question.

I want to post to my Twitter account at 3 specific times each day - different times on different days. Each day, I want to post a random photo from a bank of photos that I have online. I would like each of the photos to have specific hashtags, @ mentions and a text description.

As I understand, I will need to create a .csv file to do this but I am unsure as to how is should be structured. Also, I assume this will be a ‘Scheduled Campaign’?

Any help/guidance/advice would be great. Thanks.