I'm going to assume you're a small group of people with experience working with BI tools, both proprietary and open-source.
First thing is to understand who your target companies are. For some reason you mention companies that currently have no BI (I'm again assuming you have a good reason for this). That's a good starting point, but not enough. You should at least segment down to industry/sector, eventually region as well. Then you'll choose 1 or 2 sectors to focus on and do research on problems/opportunities within those. This information is key to approach the companies with relevant information.
Then, you need to identify the decision makers within the companies you're targeting and prepare your pitch deck based on the industry/sector information you gathered before, along with a delivery plan and, most importantly, how much your enterprise customer can gain with that.

It's especially important to understand your customer's pains and gains, and that involves getting specific information about their business. I worked within BI in several industries, so if you need some more advice on that feel free to get in touch.