If you are an engineer or scientist or doctor turning to business, the first thing I would suggest is "Please go on a lot of sales calls, face rejection if necessary, but persist".

You will develop better communication skills as you realise that explaining your ideas is not so easy.

You will develop respect for sales people.

You may even become good at business!

There is no such thing as a business without selling something. Sometimes the most obvious thing has to be said!