Now, beyond that, alpacas are not my end goal. They were free, and they're an intermediate. I intend to have either a breeding pair of yaks or either goats or dexter/highland cows for dairy. But the alpacas are pretty self reliant, and they produce a high quality manure while they eat down my brush. As I move them around I will come behind them, cut down what's left of the brush and weeds, then burn, distribute manure/mulch, then plant a good grass mix for my soil type and help it get established. I'll be using chickens at different stages for further soil improvement and weed control. This will establish, hopefully, decent grazing for my end goal stock.
I may keep the alpacas also. I need to study grazing rotation more.
Anyway, so you see that even on my second year of livestock I still have at least two or three more years as a small land holder to even get my land capable of sustaining a small herd of anything.
I'm not saying you can't do it, but its work and you have to study this stuff.
As far as hay goes, planting it is the easy part. I could harvest hay, but I live on a hill. I'd be scything the entire harvest. Which isn't really that bad, but again, it'd take time. You would either need a scythe or a machine. Most people will find a neighbor who does haying in the summer and pay them since it's more economical than buying and maintaining your own.
As far as minerals and medication: you either have minerals or you don't. If they aren't finding it in your soil, you'll have to just get a supplement. For medication, I've never done much medicating. A free range chicken of a sturdy breed (like Wyandottes, my favorite) is remarkably hardy. The most I've done is spray them with a wound protection spray when they've gotten hurt (Blue Kote), or neem oil in their coop the time I tried to use straw and they got mites. Don't buy into chickens that are bred to be weak. Better to get a few less eggs and have them be hassle free.