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Hi @Sarah and welcome to the Fiddleman Forum. I'm still too new to advise you on where to start, but I'm sure a few of the old timers here will help you. I just want to welcome you to a great forum with helpful folks. Nice to have you here.
Welcome to the forum, I'm guessing from your post you have some reading ability and just trying to improve your technical abilities.
Take a look a the free etudes on this sight in particular Schradieck exercise #1, I was working on this and recently started back on it it does work good on your technique, here is a video to help solidify what it's trying to develop.
Master the Frog and you have mastered the bow.