You should have consulted your professionals first before closing on the loan. You can rest assured that your builder knows when they will get the first draw. Your contractor had to agree to the terms of his draws when he signed the deal with your lender..
That is a question for your loan officer. Typically, with Wells Fargo, it takes about a week after closing to set up the file in our draw department so that things can begin....Best of luck in your project.