You may or may not find useful health and social-policy literature about your own community. You may have to write it yourself. To develop policy and best practice for any group involves identifying cultural beliefs and values. Quality-assurance measures of services needed for each community. Appropriate performance indicators for the providers of services.
Education is also a form of advocacy.
Do your home work before you try to educate the mainstream HIV health system about the different care needs of all HIV-vulnerable communities. Consider the boundaries of political work. We must operate within an ethical framework with clear purposes and actions. We must consider our own beliefs and values, and those of others. Collectively our communities have a lot in common in health issues.