With both of my kiddos, I introduced the sippy/straw cup at 6 months. I live in the states and my goal was to be done by 12 months
I tried many types with John but he took right away to the straw cup and so with Zoe, I just used a straw cup right away (this way they didn't have to get the "tipping back" part of it right away). Once they get really good at it, I took away the bottles and gave them the sippy with their meals. John was on all sippys at 8 months and Zoe was too except the bedtime bottle which we then switched over at 12 months. And agree with the above poster about putting milk in it. I, personally, wouldn't put water or juice in the sippy until she gets the milk down. I've heard lots of times where their kiddos will take a sippy, but not for milk.
Try not to stress over the sippy though, it's not something that they "have" to do right away...they all get it eventually