to establish the mood or style for something
establecer el estado de ánimo o el estilo para algo (establecer el estado de ánimo o el estilo para algo)
"The manager's speech set the tone for the meeting."
"El discurso del gerente marcó el tono para la reunión." (el discurso del gerente set the tone para la reunión)
to have a surgical operation
to join or agree with a group or plan
To build a company using only personal finances.
you shouldn't form an opinion on someone or something based...
an alternative plan if the first one fails
working closely and harmoniously together