Find a bank or lender who will work with you and will help you learn business from their side of the balance sheet. It will be a powerful alliance, I promise. Don't go for the lowest-priced money. Look for service, and develop a real relationship with your banker. One of the primary keys to your success is your selling price.
Most folks start out way too low.
If your financial plan is tight, meaning no margin for error, you won't make it. Set your prices high enough to cover all your costs, plus generate a generous profit and a bit more because the unexpected will happen. One of your employees might quit or get hurt. The weather may throw a wrench in your delivery schedules. Perhaps your best customer will go out of business.