Two suggestions:
1. Google Maps Street View will put you right on the streets you will be traveling. By the time you actually ride a route, you will feel like you have already been there.
2. Get in your car and drive the routes you think you'll be riding. That way, not only will you have an idea of the traffic on those routes, you will also see the routes from a motorist's perspective.
I assume you're from the "young" generation that is really into apps for this and apps for that. That's cool, but having ridden oodles of miles over 40+ years with no more than a paper map, ever, I'd like to suggest that it's MUCH more fun and rewarding to discover routes and bike paths by yourself.