Well, you'll certainly have a lot of options for where to focus your marketing efforts, since entrepreneurs are a huge market and pretty much everywhere on the web.

I'd recommend testing some different social media channels - grow a brand presence on the major networks, and if you have the budget, test some ads (I'd recommend Facebook and/or Twitter to start).

It's worth doing some keyword research to see where your opportunities lie. I'm guessing many of the ones directly relevant to your business will be very popular and therefore very expensive, so try looking for some more specific longtail keywords and phrases if you decide to focus on SEO.

I'd also recommend publishing case studies and testimonials early and often, to make it extremely clear how valuable your service is (ex: "This business owner saves himself 200 hours each year. Learn how he does it." ... or something to that effect.) Your success stories will be key in attracting the attention of your busy audience.

Happy to talk through some more strategies if you'd like to schedule a call!