This a link to GIPS. The Global Investment Performance Standards website. There's a ton of information on there and a lot of it won't be needed for your project. But going through the handbook might be useful.

GIPS is "A global standard for investment performance reporting gives investors around the world the additional transparency they need to compare and evaluate investment managers."

There's a link to the current handbook on the right. It's free.

https://www.gipsstandards.org/Pages/index.aspx