You are going to want a coarse grind for cold brew. 1 setting away from the very coarsest is great. Avoid high acidic coffees for cold brew, generally african coffees make incredibly cold brew. We use (at my shop) a combination of south american and a bit of Rwandan coffee mixed into it.
If you want to make batch ice coffee at home, let me introduce you to the
Toddy Maker . It is perfect for ice coffee batches at home, filters aren't incredibly expensive and it comes with a top for storage so you don't need to transfer it unless its to put into glass bottles to give away or take on the go.
Generally, try to go for your shops burundi and Kenya AA. Be aware that certain Rwanda coffees have something called the "potato defect" this is caused by a bug who burrows in coffee and you cannot tell it is there until they grind the coffee and all of it reeks of raw potato. You may want to simply try the Kenya AA to start, which personally is my favorite. We had it at my last shop. We cold brewed it and added dehydrated fruit to the coffee as it steeped for 12 hours over night and it was fantastic. Make sure after you brew your iced coffee, you stir it. Coffee, when brewing, puts the most concentrated bits on the bottom and over time the weaker coffee sits on top. So always stir before serving to get the full flavor.
Let me know if any of this helps at all.