I teach this type of banjo
This is the Five string Resonator or open back. The standard tuning is open G in what is called reentrant tuning.
The short high g string and getting used to finger and thumb picks are uunusual features of the banjo.
The standard banjo tuning is open G gDGBD. The last four strings you may recognise from open G tuning on the guitar .
The styles I teach are the Scruggs ,the melodic (keith ) and the Reno style . In terms of repertoire I really like to start with songs you may already know and gradually introduce bluegrass and banjo standards. The starting point will be the rolls on the right hand then basic chords and single line melodies then solo banjo pieces. There are banjo arrangements of The Beatles and Led Zeppelin that I teach and some bluegrass classics cripple creek, cumberland gap, Irish washer woman and more.