There are many wonderful instructive videos on YouTube and across the internet. So that you don’t have to hunt them down or run into unwanted ads, I’ve complied the videos I think would be helpful.
Once you have mastered the playing position of the instrument, go to the beginner Master Class for that instrument and start to play songs. You will be absolutely excited by your progress.
Beginner String Orchestra Instruments
Violin & Viola Playing Position
Cello Playing Position
Mandolin Playing Position
Since anyone who plays the violin will know the fingerboard of the mandolin and it is a great instrument to add to your repertoire.