Why are you planning on applying sophomore year? Will you be graduating high school after just two years and starting college in what would be fall of your junior year? If so, will you have all the requirements needed for acceptance and have you taken the appropriate standardized tests? Or are you just trying to “lock up a spot early” - which you can’t do?
When you tour a school, whoever you speak with will not be able to give you any guarantees. They’ll talk in generalities of strong chances for admission, and tell you about scholarships you might be eligible for - but real numbers about cost come after admissions.
Some schools that do interviews won’t allow you to schedule an interview until junior year.