Since we have just started a business for the first time, there is no experience more errors because I can't forecast what will happen in advance, just as people were doing business, many times.
Since we first started doing business. No experience The error occurs because you can not predict what will happen in advance, like someone who had done so many times on business.
Since we started doing business for the first time, experienced. It is an error because it cannot predict what will happen in advance as people used to do business here many times.