There's a lot of information on this site. There are the wonderful reviews, both video and written, by our genial host,
@Court. And then there's the forum, with input from riders that is both general (like how to keep your battery working for a long time) to very specific, with subforums devoted to hundreds of brands.
Don't overlook the subforum called "Help Buying an Ebike." Lots of newbies have asked questions that you might wonder about, too. Cruising through some of those threads might give you a lot of information you need.
And of course you'll have questions of your own, so feel free to ask.
Since you mention commuting, you might start by going to the EBR home page and clicking on the Commuting and City Bike categories. This will narrow your search down to the kind of bike you're likely to want.
Another piece of advice, to help you narrow your search down even more: when checking out the reviews, focus on bikes whose appearance appeals to you. Features and components are important, but we all want to ride a bike that we enjoy being seen on, right?
If there's a bike shop near you where you can take a test ride, don't miss the chance!
Good luck, enjoy the research, and don't get swamped by over-analyzing your choices. Get out there and start having fun!