Anything worth doing is worth doing poorly to get started.
It doesn't have to be that complicated papafat. You are trying to process way to munch info. Consider this:
1. Can you change the ph of your soil? At what cost? You are growing grass here for cows, grasses such as bermuda are tolerant to a wide range of ph levels. Find out what you have and plant a grass that will thrive in your existing soil. You may already have grass. If so, and the stand is good, don't worry about your ph. Find out what it is, so you will know what fertilizers and additives you need, if any.
2. Go to your local coop or feed story. They will only carry a few choices of protein supplement. This will narrow your choices. You may not even need protein supplement, especially if you're just running steers. Sell them in the fall when the pasture depletes.
3. Corral designs - Assume you are considering designes for working areas. Go look at some other operations in your area. Keep it simple and affordable. No need to break the bank here.
4. If you are running steers, don't worry about the breeds. Most will be crossbreds anyway.
5. If you're running steers, you will do best with weaning age steers. Six to Seven months of age. These calves should be 500 pounds to 700 pounds. Graze them for about 90 to 120 days. They should gain between 200 and 400 pounds during this time. Sell them, they are ready to go to the feedlot.
6. If you are running steers, you can vaccinate with a 7 or 8 way blackleg and you should be okay.
Find a mentor, someone to talk to about the daily activities. Get started with a few. You will learn as you go. You don't have to do this perfect. Mother nature is going to take care of about 80% of what will be involved. You only have to take care of abotu 20%. A mentor can guide you through you part.
Good luck, don't be discouraged. It may seem overwhelming, but it is manageable. Start small and grow it from there.
You can certainly find a manager, but a good one is going to cost you. If a manager is taking care of it, you are not going to learn.
Good luck