Always glad to help. Very glad to see you thinking about the nutritional needs of your animals. So many people I've met don't even imagine goats need more than a few tin cans for munching on.
The equipment you need for hay making depends a lot on how much hay you want to make and how much time you have to make it.
Minimally you need a blade, a
bucket (for broadcasting seed), a rake/fork/stick and agreeable weather. Although I would want more than that if I were to do over a quarter acre a year. At an acre, I would want a seed broadcaster, a scythe, a hay rake, a pitch fork, and something to haul the hay in (wagon/waine).
To do it on a large scale you will need a way of seeding the field,
irrigation (many swear by this, but I feel it encourages the
roots to grow too shallow, preventing the hay crop to grab the deep soil trace minerals and nutrients, causing more mineral supplementation needed for your goats to thrive - see pat coleby's book on natural goat care), fertilizer (anything from miracle grow to manure from using the hay field for grazing during the off season - again your choice here will affect the supplements you need to give your goats.
ibid) something to mow the hay, possibly condition the hay, ted the hay, bale the hay, carry the hay,store the hay ... am I missing anything folks?
Most of this equipment can be rented - HOWEVER, it's usually very busy come hay making season. Another option would be to lease out your potential hay fields and have the guy/gal pay you in hay. Hay equipment needs a lot more upkeep than I like for something that is only used a few days a year, so if you do decide to invest in it, maybe you could consider how else you can use it - renting your hay making services, perhaps?
I have a sickle and some slopes that I 'harvest' has hay and pack it loosely in wool bale bags, so I'm pretty amature with my hay making skills. Although I did buy a scythe this year, and look forward to growing a larger portion of the property as hay. As a hay buyer, on the other hand, I have some strong opinions.
Common issues with local haymakers - aka, my little rant on how not to make hay
Most of this you know, it's just frustrating how many people enter the hay making 'business' with no idea about these things, so I'm writing half for you and half for the future potential haymakers.
Weeds and grass do not equal hay! It really doesn't! You need to seed your hay field, either with annuals, perennials, or better still a mix. I don't know how often this needs to happen, but hay is not leaving an acre fallow then bundling up the weeds.
Letting the hay field grow as long as possible DECREASES the nutritional value of the hay. Many producers here wait until the field turns golden and crunchy then harvest the hay. There is a sweet spot for when hay is ready, it varies from year to year depending on many factors. But when that sweet spot hits, you have only a few weeks or days to get the hay in. Goats have sensitive little mouths, so the sweet spot for goats is very different than for cows of horses. That would be one major advantage to making your own hay, you can customize it to your livestock needs instead of projected market demands.
If you bundle wet hay, make certain you have excellent fire insurance policy and/or don't mind dead livestock. Hay needs to be tedded until dry.
How much
land do you plan to use for hay? Can you rent equipment or services for your first year? That way you can see how well the fields perform the first year before the full investment. If buying the equipment is the way for you, don't let me discourage you - I'm just thinking from the point of view 'If I xyz situation, what would I want to try/know'.
Please let us know what you choose and how it works for you.