Hi Matt
I am now 9 weeks post surgery.
From day 1 I was doing pendulum and passive range of motion exercises. I was told this is very important to prevent frozen shoulder and general loss of range of motion. I wasn't doing any active movements though, and from what I've read that sounds unusual. If it hurts then stick to the passive movements until the next time you see your doctor, and ask him about it then.
I was also told by my doctor I could take my arm out the sling for things such as typing etc. Basically I was allowed to do movements using my forearm, without any weight, or that engaged the bicep much (i also have an anchor in my biceps tendon). It was 2 or 3 weeks before I was comfy eating and cleaning teeth with that arm though, but it did come back very quickly.