depending upon climate, a person can pretty much set up a temporary shelter for winter feed storage using a hoophouse style greenhouse from cattle panels and some framing limber and a few pallets [floors and walls] 3 foot walls will spread catle panels to 12 feet wide and 8 feet center hieght and 4 feet plus with each $20 panel, cover with cheap plastic tarp and or cheap plastic from the lumber yard for one year replace if you have to wait to build a better barn....
a 3 sided shed with a single slope roof will shelter your large animals from most unsavery weather, and while not perfect will suffice and should not cost more than about $500 if you cant scrounge used lumber from some place or other.
fencing need not be really expensive either, a cow that is used to electric fencing will stay inside, and a roll of 1 inch wide tape is not expensive at $50, it will surround a good size paddock with 2 wires, The inch tape is easy to see by both animal and human.. fibreglas posts are $2 each with insulators, palced every 25 -40 feet some of mine are farther.... and for corners you can either set wooden 4x4s or just pound in metal t-posts [i have even just set 3 fiberglass posts for a temporary setup.... for a charger a short range charger isnt more than about $100 and probably half that for grid power, and a really good 6 volt solar rig only is about $300 and lasts a long time.... and sets up temporary paddocks anywhere.... something to consider long term. So for under $1000.00 you can have a portable fencesystem, and for about half that you can get started..... no not cheap, and yes you can pick up used equipment like we did... just keep eyes open at the feed store bulletin board.
now for animals to stock, if you have not been around cattle or horses, visit someone who has some, they are tempormental.... people get hurt al the time who are not used to handleing big animals, i grew up around show cattle and started handling big bulls at a very early age... yet i still have great respect for huge beasts.
The hoop house can be used to house chickens too, without building on a frame off the ground, the panels will be about 6 feet wide and high in the center when bent in an upside down "U" shape. stapled to a 2x6 will give you a skid to pull it to clean ground to keep your pen cleaner.... raise 25-50 fryers in a small pen and as they reach maturity you have your hands full of processing meat.... a hard days work for 2 people if you havent done much of that before.... same with rabbits.....
the goat idea is alright, but goats get into everything you dont want them to, sheep are almost as bad, and it takes better fencing to keep the in....
Premier 1 supply probably has an excellent syste for sheep and goats as well as pastured poultry using electric fencing, it is spendy, but i used the forunner to it 20 years ago and i loved the system... once the animals get used to being inside the hotwire they dont give you a problem.
If you dont already have Carla Emery's Encyclopedia of Country Living i suggest you obtain a copy, it might same you a headache or three on the animal choosing part.... and feeding too.
William