The below are links to check out the historical standards that most of the Reformed Baptist churches commonly utilize.
Each of the different Reformed Baptist churches may have different relationships with these documents. Some churches may be in full/strict subscription or a substantial subscription. Some have different requirements for their officers (Elders & Deacons) or teachers than they do their members.
When searching for a church, it is best to contact each individual church regarding their doctrinal positions and their relationships to the standards.