One work to keep in mind: Research.
There are lot of pieces that makes up a business. If you are not familiar with everything that has to do with your business then others can exploit you. Ex. Low ball offers on material and labor.
Most business fail to grow because they fail to do research. Business evolves and changes often (or even daily), so it is important to keep up-to-date with your market and how it reacts to the season, customers, and your workers.