Heyy friends!
Now, i'll tell you some tips before you buy a violin!
So, you'll not regret after you buy it!

T H I S :

1. About Price Range and Quality I recommend ordering an inexpensive violin online rather than getting a less expensive instrument from a violin shop. It’s just not worth it. University-level violins usually start around $1,500 and professional violins start around $3,500. Beginner violins start around $500 and if you are looking to buy your first or second violin, you most likely do not need to look in these ranges.Usually it’s a good idea that you don't tell the dealer your price range. 
2. Try It Before You Buy It Never buy a violin without trying it! It is  normal to request to try out violins at the shop. Many shops actually have practice rooms for that exact purpose.
3. Take It Home With You It's good if there a shops which are very generous about letting you borrow a violin (or several) for up to 2 weeks. You must take that chance.
4. Student Violin  A better alternative is to buy an inexpensive violin online. Because It will cost less than a student violin from a shop, and the quality is usually comparable. Student violins are manufactured quickly by machine, are made from lesser quality wood, and have a cheaper, sprayed-on finish. If you are going to visit a violin shop, get a professional violin. The good ones are hand-carved, use high-quality, aged wood, and are set up by a real luthier (violin maker)
5. Test the Sound Near and Far Another reason to bring a friend is that many instruments can sound great under your ear, but do not project as well as other instruments. It is customary to try out the various violins at the shop, so if your friend can play, you can stand across the room and see how each violin will sound to an audience, not just to you personally as you’re playing it.
6. Size If you need anything less than a full size violin, rent (don’t buy) a violin that is smaller than full size. It can get expensive to keep buying larger sizes as your child grows (you will have to do this surprisingly often). Smaller violins also tend to be lesser quality than full size instruments, which is another good reason not to buy until your child is big enough for a full size violin. 
7. Old vs. New New instruments tend to be less expensive, especially if the person who made it is still alive.This is partly because aged wood tends to sound better than newer wood, but also because if the luthier is no longer around it gives the violin a certain limited edition quality. Many newer instruments sound just as good as older instruments. We recommend going for the best sound and worrying less about the age of the instrument.
8. Also ask what kind of wood is it made from? This affects the sound tremendously. If the chin rest on the violin you are looking at is made from plastic, it’s a good sign you should move on to the next 

 That's all guyss, I hope it can helps you!