I have a Salvatore Cadoni 100.. is it a beginner’s violin?
This is hard. It appears that the Salvatore Cadoni model 100 is a viola. The Cadoni violins in that number-range are 80 and 200. However, all the Cadoni instruments in this model-number region are beginning-student to intermediate-student instruments.
Measure the length of your instrument. If the total length is greater than 21", it is a viola. (Viola sizes are named for the body length, 13" to 16", but the overall size of violas runs 21" to 26".) Generally, violas are 1" to 4" longer than a 4/4 violin.
Regardless, your instrument is a beginner’s instrument.

Lesson 1. In this video, I explain how the hold the bow and the Violin correctly.
Jenny explains the basic bow hold for new violin players.
After a few years at piano, this young woman wanted a challenge, so she added some violin to her daily music menu! Here she is at her first violin public recital performance.
An instructional video clip by YMI teacher Greg Gutmann on how to properly hold your violin. A must for beginners!
http://ViolinLab.com. The home for adult learning violinists. This video demonstrates the proper placement for the left hand and thumb in relation to the neck of the violin.