You've received great advice above. smile

I would suggest beginning by learning how things currently work in your State and in your school.
- Become familiar with your State Laws
- Become familiar with your school's policy/practice statements (often found online at your school or district website).
Print copies and organize these into a ring binder for future reference, because laws and policies may change over time.

Gather evidence of your child's readiness for the advanced coursework.

Become familiar with common gifted-ed "buzzwords" so that you may understand what a school may offer you... prepare to ask gently probing questions.

Understand that kids need challenge (you may want to print the linked article in this post), and also understand that the current focus of public schools is closing achievement gaps which may often entail capping the growth of kids at the top... teachers may be evaluated on successfully closing achievement gaps; Their compensation and ability to remain employed may depend on this. With your child's need for challenge and the teacher's need to close achievement gaps being potentially at odds with each other, you will understand the importance of preparing carefully and advocating respectfully.