The people you ask to write a letter should know you well and believe that you will be successful in college and in your future career. This is an opportunity to develop a relationship with a teacher or community member that may serve you as a mentor and to recommend you for college admission, scholarships, internships, education abroad, and jobs. You should start talking to them now, seeking their advice on what colleges you should consider, what majors and careers there are that suit your interests, talents, and abilities, etc. Ask them how they got where they are, what strengths or experiences served them best, and other questions to start a dialogue. Think of how you will feel someday when someone thinks enough of you to ask you to write them a letter of recommendation.
Most people feel honored to be asked.
Scholarships provide us that opportunity, and those who give the funds for scholarships recognize the benefit that will come to their communities, businesses, and country.