I'm hosting a show this Sunday, and have had months to write a script. My original deadline was the 3rd, but I was asked if I could get some version of it done today. I thought I was fucked.
First of all, it's very important to understand the values and worldview of the people from that time. You can achieve this by reading lots of ancient material, and immersing yourself in the thought process of the writers. Of course you can read modern analyses of those works.