Hello Aspirant,
Following are the steps you need to take for admission in abroad schools:

1: Firstly, you are required to find a school in which you are willing to go.

2: Secondly,if you are in poor financial condition, you can also look for scholarships. Mostly scholarships are available for graduate and post graduate courses, but there are some organisations which can help you with scholarships.

3: Thirdly, you are required to arrange all the necessary documents for your admission process. These include your marks certificates, letter of recommendations (if the school you are interested in is asking for LORs).

4: Apply for the schools. It's better to target more than 1 school, just in case. You should target your dream school but also apply to some safe schools where you are sure you will get the admission.

5: After the acceptance procedure, there should be a guardian to take care of you as you are underage.
Best of luck!!