Some photos of your system and venue would be really helpful. There is a place under your user ID to create virtual systems.
In general, the biggest challenge will likely be right and left. If there is a lot of space on the right and a close wall on the left… then treatments on the left can equalize the open space on the right.
But I definitely agree… take your time. You can simulate treatments with thick blankets and pillows to shape your sound space before investing in expensive treatments.