@Sherise Stewart - Buying a duplex and living in one unit can be a good option if you can find a good deal. Buying a triplex or a fourplex might even be a better plan.
I always hold my properties in an LLC. Depending on the rules of your State consider setting up an LLC right away but make sure you check with a local professional first, as the rules are different in every State so you want specific, local knowledge before creating your new entity. A local RE attorney and/or CPA with the specific investment real estate knowledge will give you the best guidance for your needs. You will need these people on your team soon enough, so this is an easy way to build that relationship.
Your credit is important to help you qualify for the mortgage, but it isn’t more important than the property itself. Finding a good deal and having a good business plan will be the most important factors in the loan approval process.
However, you want to develop and keep the best credit rating you can. The better your credit, the better the terms of your loan. (typically) Be careful about too much credit card debt; try to keep your balances around 20%-25%, much higher and it will impact your FICO. New credit cards can also negatively impact you for a time. If you are getting ready to submit a loan application for real estate, I would not apply for anything. Work with what you have right now; assuming you have some credit. If you don’t have any credit or need to improve your credit, then you could make that step 1 in your real estate investor business plan. You should target a FICO score of 660 min. to qualify for an investor, non-owner occupied purchase; as mentioned before, the better the score the better the terms so keep in mind that just because you can qualify at a certain score it may not be in your best interests and adding an investment mortgage could knock your score down for a period subject to debt to income and other variables.
You will need the EIN to open a checking account. And you will want your entity before the EIN so I think you should start working on those right away. You want to have all the administrative tasks out of the way as soon as possible. When you get your new property under contract your going to be busy with the Loan and possibly the Rehab budget… not to mention about a thousand other things.
All the Best!
Wren