How do I become a caregiver to my grandmother?

Don't do it! You are too young and need to grow in your life. If you want to do it because you may be paid that is the wrong reason. The only way that you could be paid is if grandma has resources to pay you and you get a contract with her or her power of attorney if she is incapacitated or if she is eligible for veterans benefits under "Aid and Attendance" which requires financial eligibility because of insufficient resources.

Live your life, start working towards your goals that is what should be most important to you and it would be to grandma as well.

Ask your grandma's Medicaid case worker if you can be trained to do this. If she is not on Medicaid, she will have to pay you from her own money.