Once you have a girl in mind (my advice another homeschooler)
1. Strike up a conversation. Get to know her. BUT BE SUBTLE.
2.Write her a Secret Admirer note. Or two. Or six. If your doing a bunch of 'em, slowly give her clues to your identity. Then five the biggest clue on the last one. If she guesses you, then continue to be better friends. She'll warm up to you.