Hi Swayam,
Here's the roadmap you should follow-

Read about the course.
Computer Science is a vast field and AI itself has a lot of applications.
Read blogs & look at YouTube videos to find out what you want to specialize in. Go through the universities that offer your chosen course.
See if the syllabus matches your interests.
You can start your search with the Top 20 CS Universities in the US. There are certain requirements for a need-based scholarship.
You need good academic scores and extra-curricular activities on your resume.
Plus, you should have documents to prove your financial status. For extra-curricular, participate in sports, music, etc. - a field that interests you.
Volunteering in an NGO would be a great add on.

Let me know how else I can help.