- Schengen C visa (short-stay) can be issued for single or multiple entries.
Typically a first-time applicant will be issued a single-entry visa with a short validity period and duration of stay. After several visits without overstays or other incidents, they will get multiple-entry visa with a longer validity and a duration of 90/180, i.e. up to 90 days within any 180 days.
- The visa application will have to explain the premise for the first trip -- what are you doing in Schengen and why? For a business trip, it would be usual to name the business partners you are going to meet, and to get a confirmation from them. You can try to explain the premise of your trip without such a letter, but that's unusual. Are you going to a trade fair without interviews lined up? Then mention that.
So if your financial and personal situation is solid, and if you truly cannot predict the date of even the first business meeting, you might try to make enough successful tourist trips to get a multiple-entry visa (which can then be used for tourism or business).
More reasonable would be to fix the date of the first couple of business trips, until you get a multiple-entry visa. Surely your business partners will understand that you need some planning time to get a visa.