I totally disagree with having to start farming all 100 acres ASAP. There's nothing wrong with leaving a bit of land to rest for a bit while you start small on something. But first, you need to analyze your land, soil, topography and neiboring farms to see what is the best for you to start up with.
The most important thing is to have a good look at your soil. Look at the quality, the type and how much of it would likely be suitable for your operation. Take a sample of soil to a soil lab and have it analyzed for nutrient, type and quality to see if it is good for cropping or livestock or both.
Next, have a look at your bank account. Note the amount that you already have and compare the start up costs necessary for starting up either a crop-only farm, a cattle farm, an orchard, or a mix of any or all three possible enterprises.
Do some research on start-up costs and what it takes to start a farm. The thing that every author of every starting-a-farm article will tell you is to START SMALL and don't get in over your head, because, though I hate to be blunt, but it really looks like you are getting a bit too in over your head. There's absolutely nothing wrong with keeping a portion of your land to woodland or wilderness for the first 2 to 5 years of your farming enterprise. You can start getting rid of that little by little, but not all at once in one year. That's just ludicrous and financially very risky.
Finally, have a good look at the farms, ranches and acreages around you and see what they are doing and what they are raising.
If the soil is as good quality as it is in the Corn Belt, then you can consider growing crops. If it is not great, then it's better if you seed that newly tilled field into grass and keep it that way. Your start-up costs will be higher for starting a grain operation because of all the machinery and capital you will need to till, sow, spray, harvest and store your crop. It's the same for the orchard, not to mention the amount of time you have to spend to wait for your trees to reach their potential enough to let you even have a decent crop. For a cattle operation, if you start small, start-up costs are lower than for a cropping operation because all you need is to plant fence posts. You will need to plan a lot more, yes, especially for a good grazing operation, but you won't have to worry about the money you have to spend on fuel, fertilizer and herbicide to care for your crops.
The most important thing you MUST know is to start small. If you start at the deep-end, you will go bankrupt before you can even think about what to grow or raise for next year. That means ONLY start with one or two things, THEN work start to diversify if you feel you should or want to.
And finally, the thing to consider is that farming is mostly a way of life, not a profit-venture. If you want to start something that will get you to make money, then start a shop or something in the city. You won't get very profitable very quick if you throw all your eggs into one basket so soon.