Well,i only have one thing in this area.
For 3 years i wrote,recorded and performed on a short wave pirate radio show.It was not uncommen for me to do upwards to 4-6 voices within the show,and try to write something for it.
My 3 main characters i did were...A pirate style voice.
The character`s name was long bong Doobie,i know,sorry.
Who would do the opening and the closing for the show.
Character 2 Was part of a two person hosting.His name was Hooch,a laidback sufer type dude.Most his lines were adlibed at the time of recording.
Character 3 was a Hindu style named Guru,Guru.This character would do spots thur out the show.
So,here i am at 48,wanting to get into this business full time.But,we all have to start some where.
I`ve had no formal training in this area.