Hello Wren and welcome!!
I gave you some acorns, they are used if you live in the US as a way to purchase raffle tickets which I think is going to be happening once per month for this year!
From me you have enough for one ticket! Good luck and welcome!
Totally agree with Dirt that it depends on your local situation, many of us are from the Pacific Northwest and rain is a constant so we talk about drainage, but then I find myself having to water regularly during summer because the drainage is too fast...figuring it out is work. I will say that for me using less rather than more items in the mix seems to be good. Currently I just use pumice, regular potting soil and chicken grit. Then top dress with chicken grit (unlike Lynn I use the smallest kind, so it is like large sand, it dries really quickly and the plants seem to love it!) Like Lynn and others, I make the chicken grit deep, like 1.5 inches or more, but again that is a personal thing, I feel it helps the chicks to root and therefor builds up a colony faster.