What you describe is the weakness of most businesses. Lack of knowledge is also an important factor.
I believe the most important thing for business owners is to find partners to be able to communicate and find a common ground for discussions and ideas.
Now as for the marketing and business development, you need to find experts and add them to your team.
From what I undertand you do not have the knowledge to test their experience. There a lot of companies doing such things globaly.
You also mentioned that your product is for the global market. My advice is to make a market research and find the best countries for your product so as to keep the budget low and make tests. It is very difficult to go global from the beginning.
If you need any help for marketing/digital marketing this is my field. I can advice you how to make a digital marketing plan (what channels to use) according to your objectives, budgeting, measurement (kpi's) etc.
I believe that the most important thing for you is marketing so as to find out where to promote your product.
Marketing uses the same techniques what changes is the product.
I can advice you where to start from and go step by step. This is free of charge.