You have practical questions. These are legitimate questions, although they are not as important as they might be in other fields of study. History deals with everything that has happened to man. History is deeply involved with language and communication, not only because it concerns itself with the ways in which people have related to one another, but also because history, as a subject or discipline, can only be set forth through the medium of language. The laboratory or workshop of history is society.
Ideas become relevant only when they are expressed, shared, communicated.
Consequently, because of its breadth, its concern with people and their institutions, and its essential connection with language, the study of history prepares a person for a considerable number of occupations and professions to which these qualities are central. The obvious thing is to pass it on, in other words, teach. But the teaching profession today has fallen upon sad times - like in the past, or any other particular time period you want to pick. The market is always flooded with clever competitors. But there are other ways to utilize your knowledge and perception of history.