USA

Depending on the information available, I would suggest you below steps:
1. Decide countries which you want to apply to
2. Check if it's financially feasible for you to study there
3. Shortlist universities there which you want to apply to
4. Shortlist courses you are interested in
5. Check the criteria of the universities if you fit it
6. Check if you need to pass any tests IELTS TOEFL GRE GMAT)
7. Collect all your past academic/work ex documents
8. Write a SOP and get at least 2 letter of recommendation (from school principal, college HOD, manager)
9. Apply to universities
10. Accept offer (s) within time frame for the university and course you want to study
11. Pay the minimum fee required to secure your seat and as per visa requirements
12. Apply for visa as soon as possible (most countries allow you to apply 3 to 4 months in advance of your course start date)
13. Inform university once you receive your visa
The above information is very generalized and might change depending on country or university, but I hope it gives you an idea about where to start. Counselors can assist you with most of it.