When two business entities combine into one, there are bound to be "pain points." Whether the companies have been friends, rivals or complete unknowns, the process is full of risks that can end up derailing a perfectly good plan. In other words, just because it looks good on paper doesn't mean it'll work out.
Deciding to start a new business is a very exciting. Before getting ahead of yourself, consider issues about structure and creation. Your early decisions will have a long-term impact.