Wondering if a simple company website ill suffice of there's more to it than that. How can I reach potential clients which mostly are senior executives and huge corporations by building a website?
You might consider trying heavy LinkedIn marketing for such a thing, with just a simple web presence to state your qualifications and give people a way to contact you. This particular market probably isn't out there Googling for your offer, so using a website and SEO wouldn't be that useful. You may also want to network heavily in the industries that you are trying to reach, because you can meet contacts that can introduce you to the people you want to meet.