If you go the route of not having an LLC and you get sued, than all of your personal assets are in jeopardy. In a lawsuit, They can not go after your personal assets or your other businesses when your property is purchased under your LLC. Forming an LLC now, minimizes risk and will not only offer you the financial protection of only impacting your properties under the LLC, it will also give you tax breaks for everything you purchase under the LLC. It will give you the opportunity to build your business credit. Which can later be used to purchase homes. You don't have to get a loan from a traditional bank, there are private money lenders willing to give loans to investors.
Especially investors with proven track records of success. Private money lenders want to know that the numbers on your deal makes sense, and that you will be successful in your venture. You can find them on this website, or by doing a Google search for other investor websites, than looking them up. Both forming an LLC, and not forming an LLC have pluses and minuses to them. It just depends on what strategy you want to implement for wealth development.