First of all, you should visit the website of education department of your relevant state. Download all information regarding the regulations of funding for charter schools.
On the education department website, you will find a tab of Charter Schools Programs, which contains the important information about the regulations of grant program for charter schools.
Carefully read all regulations and requirements for getting your charter school funded by the government. Evaluate your school whether it is up to the mark and fulfils all requirements or not.
The most important regulation for getting funds for your charter school is that it should be affiliated with the State Education Agency.
Non State Education Agency schools can also apply for funding by following a sub-grant program and you can also get the details of this program from the education department website.
After evaluating the position of your school, you need to fill a grant application form and submit it to the concerned department before the deadline.
You should also look for other education grants for charter schools and see if you qualify for applying for these grants. There are also federal grants for education and you need to evaluate your charter school and apply if you fulfil the requirements of funding from federal grants.
There are many private organisations as well that offer grants for charter schools. You need to find out such private organisations that are working in your city or state.
Contact to these private organisations that provide funds to educational institutes particularly charter schools. Try your best to fulfil their requirements and chances are high that you will get a considerable amount for your charter school.