Well.... I was a teacher for 12 years earlier in my life. That is NOT something to go into if your heart isn't into it. That's why you see teachers sobbing from stress in the Teacher's Lounge, then putting on their "happy faces" and heading back into the classroom. That's why over half of all teachers leave the profession within 5 years. If you have any doubt at all about becoming a teacher, forget it. Trust me.
As others have said, starting from scratch raising cattle for a living is barely a viable reality, unless you just won the lottery. Some people do it the old way; they don't spend $700 per cow per year. They just basically give'em their shots, turn'em loose, round'em up a few months later, and haul them to the sale barn. Maybe put some hay out in the winter. But again, starting up is the boner. You want, say, 500 head, at 8 acres per head, that's 4,000 acres. You're looking at a 7-figure number buying a place like that, plus fencing, cattle, barns, handling equipment, etc. Can YOU round up and handle 500 head of 1,200-pound animals? Picture it.
I know of several people who have supplemental income raising cows. They'll have, say 200-300 acres, run a few dozen cows on it, maybe a bull or two with some mama cows, but keep everything simple. It's common to have a "side pasture" for growing some hay on, to put up for the winter months.
But to go out with your hands in your pockets and expect to start in the cattle business and get your first paycheck next month, it's not gonna happen. Heck, some ranchers spend their whole lives ranching and never have a year when they turn a profit at the bottom line.
There is something to be said about the tax business and I won't repeat the information that's been given here. It is good to have a good CPA that knows the farm and ranch business. If you set up a farm operation (register the ranch name, have a commercial checking account, maybe a web site, some management software, etc.), you can get a LOT of tax deductions, even if it's just a few acres with 5 cows. Register your truck as a "farm truck." Then all repairs, tires, gas, maintenance, etc. for that truck are tax deductible. Same for the tractor. Power tools, welders, pesticides, sprayers, feed, hay, hand tools, fences, gates, pond management, land clearing/hauling, storage, building materials, etc. are all tax deductible, as well as expenses related to operating the business itself: software, paper, computer/printer, etc. If you go to seminars or workshops, you can count mileage, food and hotel expenses, as well as the workshop fee. Then you have depreciation on all your capital assets. Things like the truck and tractor, all your fencing, storage buildings, ATVs, etc. all collect depreciation expense every year, and that is all tax deductible. But again, get a good farm and ranch CPA to handle this for you, and talk with them NOW - don't wait until a week before taxes are due.