@greg88
I attached a photo of a soil mix that I made yesterday. It is approximately 10% coarse perlite, 10% fine bark, 5% pumice, and 75% potting soil (all on photos) that has a high percent of shredded wood particles. The mixture is very porous and light.
Actually, I discovered that what goes into the mix does not matter that much. It just needs to be porous so the roots have air.
@FiggyFrank
I remove the cup first, let the leaves grow a bit. By the time they are the size of a dollar bill, they are hardened enough that you can place the pots in direct sun (like that unknown in a square pot). The leaves become very hard and thick over time. Initially, you want to try the partial shade to be on a safe side.
@DallasFigs
I attached a photo of the bark bag. Yes, I cannot find this at my local HD too. Try the smaller stores/nurseries that deal with orchids, they definitely have a finer bark. I tried a few pots with some play sand too but didn't like it too much. It seems it is too compact and prevents the air to freely flow. Those figs were the slowest growers for me, unfortunately. On a good side, I didn't have any gnats in those pots.
In general, the fig roots do not like to be disturbed and overwatered. If you let the figs be, the nature will take care of the rest.