Hi, I am new to Archinect and I need help!

firstly I need to say that I am a foreigner who wants to study abroad after my high school. I want to get my bachelor degree, so is it compulsory that I need to go for  'undergraduate school/university' ? Would you all mind to give me some advices on how US education system really works ? And what if I am interested in taking Interior design for my bachelor degree, will I be able to take architect for my master degree ? Or do you have any better suggestions about my plan ? Can you help me name some local universities that's really good or just as good ? I want to explore more and not just US, thus I am fine to know about other countries too! Like Australia, New Zealand or UK :)))) I have do some researches but still a little lost. Somewhat I feel that just google is not enough, and sometimes doesn't answer my questions. Therefore, I need your help guys! I need your opinions and advices!