Yes, it is easier for a LLC or a corporation to get a loan if it is an established business and has assets which can be used as a collateral. Most of the banks prefer to work with businesses which have a more legal structure than a sole propretier because this way all the financial records are maintained separately than business owners personal records.
In order to protect your business and intellectual property you may need patents and trademarks. Below is a brief discussion of patents and trademarks, however it is strongly suggested that you should speak to a Patent & Trademark Lawyer before filing your application.
Legal representation is very important to run a business smoothly and successfully. From the inception while deciding the business structure to hiring and firing employees and signing contracts you must be represented by a qualified business lawyer. Below is a resource which can help you find a business lawyer in your area.