Invoice factoring from a factoring company is not necessarily going to be available for every business owner. Companies without invoices, or a company trying to get formed will need access to other forms of capital. One option is the local bank. Local banks are tasked to help small businesses. If the amount needed is fairly small, under $25,000, you might qualify for a signature loan. The loan is made out to the company but you are personally signing for the amount borrowed.
In order to secure a signature line of credit act like a business owner trying to get a loan. Put together a package that includes; information about your business, a list of customers you have lined up, show what money you have already invested in the business and most importantly, what are you going to use the capital for, and how do you plan on repaying the loan. Then take your package around to local banks, but do not be discouraged if a particular branch turns you down. Go to a different branch of the same bank and try again. What you are looking for, if your business idea is good enough, is an internal champion. Keep going until you find some banker, who believes in you, and is willing to shepherd the loan through the banking process.