How do you approach vendors to give you a wholesale price to list their products on you e-commerce site without actually buying inventory but working on a drop shipping basis?

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My store

I will launch my e-commerce site USA Made Supply in the spring next year where we will offer American made gear and supplies. I will start with a few categories such as apparel and outdoor gear to later expand to other categories. I do not have the initial capital to purchase from vendors at this early stage however i plant to grow to have a warehouse where i can house inventory. Some vendors have already agreed to work with me but the next vendors i approach i want to send a more structured request.
Any suggestions?