Scales are the laboratory for your violin technique. They mainly serve to get to know the fingerboard and the distances between the notes. Music is made out of scales and you should really have them in your fingers. Besides that you can use scales to practice particular bowing techniques.
Practice a different key every day, playing the scales, arpeggio's and double stops. You can find those in the scale book Perlman used from a young age: Scale System by Carl Flesch.
In practicing scales it's important to listen very carefully and go back when something is out of tune. Don't just correct the note, but practice the transition from the previous note to that note. In that way you'll learn the distance and how to get to that note.
In the second hour you practice etudes and technical exercises. In the first years you can start with Wohlfahrt etudes, move to Mazas and Fiorillo etudes later and practice more advanced etudes by Kreutzer, Dont and finally Paganini caprices.
Every etude is aimed at a certain technique. Think about the repertoire you're playing and about which technique you want to improve on. Choose an etude that 'teaches' you that technique. You certainly don't have to follow the sequence of the etude book you picked.
In addition to etudes you can do technical exercises by Dounis and Ševčík.
PS: You might not be familiar with all the name dropping here. The good news is that most etudes book are old and therefore right free. You can Google the names and download most books for free :).
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Yup, I know you actually want to start with repertoire right away, but practicing scales and etudes first gives you a great warm up. You'll notice that practicing your repertoire will be so much easier and more effective. You have your 'technical toolbox' at hand and can focus much more on musicality.
I know you might not have the time to practice three hours a day. Maybe you have just half an hour. Still you can use this practice schedule, just do 10 minutes each or have a 'scale day', 'etude day' and 'repertoire day'.
It's hard to find the right balance. In my conservatory days I played two hours of scales each day, two hours of etudes and technique and just one hour of repertoire. Later, when I had concerts and orchestra rehearsals, I had so much repertoire to practice that I hardly practiced scales and etudes.
However, try to find the right balance. Do you have a busy time learning a lot of repertoire, see if you can fit it some scales and technique even if it's just a warming up. The results are so much better.
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