You can order a full natal (birth) chart by accredited websites, yes you'll pay but it's worth it. it goes off of where you were born, positions of the earth at that time and the time of birth is essential to you're planets. Cusps are just a mix of two signs. if you're born towards the ending of the sign like one can be a Taurus/Gemini if they are on the last day of Taurus and beginning of Gemini.