@Ethya Lawani Congratulations on the new adventure you are about to begin in real estate investing. Trying to protect your assets by forming an LLC probably won't be successful, and I'll tell you why in a minute. But if you want to form an LLC, you can go to the Texas Secretary of State website, https://www.sos.state.tx.us/co..., create an account with their SOS online portal, and for about $300 bucks file a certificate of formation. That creates your LLC, legally. Since you are the only owner of the LLC, the IRS will consider you a "disregarded entity" for tax purposes, so you won't need a separate tax id, and you file all the income and expenses on your personal return. Now, real companies also have operating agreements, which specify all the big picture items of how the company will do business, who the officers are, how they get elected, etc. You need a lawyer to craft that for you. They have their own form documents, so they can spit out a basic one for you at a fairly nominal cost. Then you have to go through the motions to have a company. This means having annual meetings, and then signing minutes of those meetings, and storing them in a way you can find them later. A lawyer can help craft annual meeting minutes for you. Finally, you need to make sure you business has separate bank accounts, and the money is accounted for like a business would. So you may need to pay an accountant to keep your books proper if you're not familiar with business bookkeeping. You need to do all these things because if things ever hit the fan and you get sued, the first thing a good lawyer will do is try to "pierce the veil" of your company, say its a sham company, have the judge disregard the entire company, and then go after all your personal assets. If you ever do get sued over something, you'll spend a bunch of money paying a lawyer, whether you win or lose, so in a sense, you always lose because you're out the money. That's why this strategy isn't always as successful as people hope it is, even after you spend all that money doing these things I outlined above to protect yourself.
Here's an alternative strategy that works pretty good: buy insurance. Most of your liability in real estate can be insured away. Find an insurance company that specializes in helping small businesses, such as people who have dba's, for example, and ask for a) property insurance for your REI investment, b) but also "completed products coverage" for your property rehab business. Best part, if you get sued for something, the insurance company's lawyers will now go to bat for you at no charge. And if they settle with the person, the insurance company pays the settlement, not you.
Finally, sometimes real estate investors can suffer from analysis paralysis. What I mean is, it's great to look at all the pros, cons, numbers, and spreadsheets, but at some point, I want you to pull that trigger and take a leap. Run a good business with good ethical practices and create a good product, protect yourself with insurance, and you'll do just great.