First and foremost, 1) get an EIN (employer identification number) from the IRS. Can do this online or through the mail but online is instant and will have a number in seconds after anwering some questions. Second, 2) open up a bank account in the business name. It can be simple like mine which the intatials of my name like ABC Holdingings Inc or ABC Reality LTD, so on and so forth. 3) Register within your state and local municiplities. After all of this is done, your are legally to go and make sure that any loans or monery related to the business goes through the business account and try your best not to mingle personal and business money as this will keep record keeping simple. Keep all reciepts and any other paper work for three years from the date of the record as to the IRS has three years from a return to aduit. This is not as scary as it sounds if your records are kept in good order (don't let people fool you) as I been through one in the first threes years of mine ( second year of operating) and I was in and out in 1.5 hours and most of the time was me talking to the auditor about personal things like our kids and spouse and the the weather. Also het a profile with Experian and Dunns and Bradstreet which most lenders will use to look at the business credit. At any cost, try your hardest to not sign a personal gurantee with any lender as to this will put you at personal risk of something happens like a lawsuit against the business, all of your assests including yours and the business will be used and if the business fails for some reason, you are personal liablile for the debts of the business. This can be difficult for most start-ups but can be done. A good way to avoid this is to save up as much monery as you can and out that money in the business account to use for some start-up costs like a good potion of inventory ot a down payment on real estate and takeit from there.