We need your unweighted GPA, core courses only, on a 4 point scale, where A+/A/A- = 4, B+/B/B- = 3 and so on. Many schools will calculate your uwGPA like this.
Step one is to talk to your parents about budget. Is IU affordable at around $25K per year, if you don’t get any merit or need based aid?
The Mizzou link works for me. You can get any school’s CDS by googling the school name and CDS or common data set.