I was in the same situation but not sure I have any helpful advice. When I bought my bike in 2007, I hadn't ridden a drop bar one since maybe the late 80s? I took my bike out for a very short test ride at the store and I hadn't a clue how to shift it.That I bought it was probably not the smartest thing, given how little I had test rode it or knew what to do. But it has worked out fine for me.
So no help for you, but lots of empathy.