When the time comes to fill out applications you can combine parts of these different essays to make one comprehensive essay. Obtain the forms early and get them in as soon as possible. Applying to medical school is an expensive proposition. You should probably apply to a minimum of about ten schools, including all of your state's schools. Only apply to schools you are really interested in attending.
Some medical schools require secondary applications.
These will ask you for an additional essay or two. This is where the schools get to know you in person, before now you have just been a picture and some words on a piece of paper. Tell me about yourself. Think about your agenda for the interview and be prepared to guide the interview into subjects that present you in the best possible light. Read and ask questions about the school you are going to be interviewing in.