Regarding the strings, you can obtain them from the same places where you buy a violin or from online retailers that specialize in musical instruments and accessories. Violin strings typically come in sets, and the specific type of strings you need may depend on the type of violin you have and your playing style. Common string materials include steel, synthetic core, and gut (natural material made from animal intestines).
When selecting strings, consider factors like tone, tension, and durability. You may want to experiment with different strings to find the ones that best suit your instrument and playing preferences. It's also important to periodically replace your strings as they wear out over time to ensure optimal sound quality.