Math trains your mind to think logically. In my personal option is that you should take all the math you can regardless of your major. I also think that you should also take the most challenging courses you can. You (or your parents) are paying a lot of money for college. Get the most out of it.
I did not see if you were directly admitted to the business school. If you were not and have the grades to be directly admitted before August, get that fixed now. Contact the direct admission POC at the following bschool@indiana.edu. See link here requirements http://kelley.iu.edu/Ugrad/Admissions/Future/page39066.html
If not directly admitted realize that you need to complete the required b-school freshman year course load with a good gpa. See http://kelley.iu.edu/Ugrad/Admissions/CurrentIU/page39067.html
Do not overextend yourself and have to withdraw from courses or do badly in something. This will negatively effect regular application to B school at end of freshman year. You need to balance this goal with taking the most challenging course load comment made above.
Realize that most employers ofb school students are primarily interested in GPA. Don’t party or over extend yourself and get a poor GPA. You should shoot for 3.8 if possible. This will allow you to get a job you want or leave the option open for grad school in business or any other field of interest. Key is you always want to leave your options open. Having a solid GPA allows you to keep your options open.
Always have a plan A and a plan B. There is nothing wrong with changing your plan, you just need to have a plan to give you some direction. It helps having some short term and long term milestones to reach for. Is important to get some sort of sense of accomplishment when you accomplish each milestone in turn.
Sounds like business honors is applied for at end of freshman year. http://kelley.iu.edu/Ugrad/Academics/Honors/page39063.html
They require that you maintain a 3.7 GPA once accepted so I assume they only accept freshman that have at least a 3.7 to begin with. Another reason to shoot for at least 3.8 GPA.
I know you can not take finance major courses until ICORE completed. Likely the same for international business (exception maybe some sort of required overseas experience for credit). You need to read the document at the following link. It explicitly spells out requirements/courses for different business concentrations and what prerequisite there are for each course. http://bulletins.iu.edu/iub/kelley-ugrad/2014-2015/kelley-ugrad-pdf.pdf
You should also read about general education requirements and what courses you will place out of based on AP credit and SAT/ACT scores in document at this link. http://bulletins.iu.edu/iub/general-education/2015-2016/gened-pdf.pdf
The goals you mentioned above sound very doable for any determined freshman. If you are interested in international business and/or Spanish then just jump right in. Target an area of the world (set a goal. Remember goal can change. just set a goal). If the region of the world you are interested in speaks Spanish than do whatever it takes to become truly fluent in the language. Only way to do that is through immersion in the country that speaks the language. Set goal of at least 1 semester, preferably a year or multiple summers, in the country to get immersion experience. Dual degree or minors are not important. The fluency and the experiences are what is important.
Widen your experiences. Definitely take a range of courses to sample different things depending how much space you have in schedule. Join a club. Take a painting course. Try out for a play. Take a psychology course. Volunteer to bring meals to shut-ins. Invite an international student on your dorm floor that doesn’t have many friends to go to the football game with you and your friends.
Finally when you get to IU try to avoid the partiers and hang with more serious students with similar interests. I am not saying study all the time. Just avoid the booze and the drugs (not saying the are drugs at IU) and make the best use of your time there.
Example of a goal. My son is a Kelley direct admit this year. Target concentration is finance. Already has a high level of German fluency in part from prior immersion experience plus extra study. Will be trying to take advanced German course every semester. Will pick up Business German certificate along the way. http://germanic.indiana.edu/undergraduates/certificate.shtml Will try to do two summer internships in Germany. (one before senior year, one after)
He will also be doing Chinese language flagship. http://www.indiana.edu/~flagship/index.php/chinese-flagship-program/curriculum19-v-1-1.html
When not in Germany for the summer, he will be in China doing immersion study. Fifth year will be in China for capstone year. This is a very demanding schedule. The disadvantage is that he has zero flexibility in schedule to try other things. His schedule already requires taking 17-18 credits of required courses each semester for 8 semesters plus 6-8 credits each summer for each of the Chinese language immersion courses. Will have close to 150 credits at end of capstone year but only needs 120 to graduate from Kelley. This is an extreme example of setting a goal (in this case multiple goals) but he knows what he wants to get out of school. He will likely achieve it and I wish him luck.
Same goes to you. Set a goal just beyond what you think you can do. Push yourself and reach the goal. Once that goal is accomplished you will find that you have grown. Then set another goal just beyond what you think you can do and grow some more. I wish you luck.