AAAAAAGH! I am so excited for you! I LOVED teaching 5th grade - between the kids and the curriculum, it's the best! To tell you the truth, fifth graders are really not all that different from first graders. They still need lots of engaging activities, are thrilled with innovative practices, and thrive on your strong management of their behaviors.
Because in our district, students have all had their Google accounts for several years now, they should be well-versed in most of them. My guess is that they have been heavy in Docs, Slides, and maybe even Drawings. I see so much untapped potential in some of the other tools like Sheets and Keep, and there are a zillion ways having students actually create Forms could be really cool at that grade level.
So what I think I'm really saying is... it would behoove you to learn the heck out of the Google Apps (aka G-Suite ). The very, very best way that I think you could/should go about doing that is by learning the components through Google's educator training program and taking the Certified Educator exams. You can definitely take courses (the MCCE Summer Tech Summit would be a great one, for example), but I have a feeling that most innovative teachers, such as yourself, would get more out of going at your own pace and extracting from the process what you need. The courses and exams don't just cover how to use the tools; they focus more on the pedagogy and classroom applications - PLUS there are so many things in there that you never even knew existed!!!!
All that stuff you've been doing with your iPads in first grade? You can still make that happen with the big kids. Keep that in mind - you're just leveling up with different apps, tools, and devices.
Relish the adventure, my friend!