Yes, the site was closed since Covid!
First things first, you’ll need to plan a route based on the places you want to visit. Google Maps is a great help for figuring out which sites to see and getting a sense of distances. Also, this site from a forum member—
https://west-usa-dream.blogspot.com/—is a goldmine of info for certain states.
For flights: As I mentioned in my previous post, I use Google Flights and its different features—"calendar" and "price graph"—to decide on the best dates, and "track prices" to get alerts if prices drop.
For accommodation: Once the route is set, I check Airbnb, Vrbo, or Google Maps to find what suits me best in terms of quality/price (often, for just one night, a motel is more cost-effective, but for 5 nights, if you need 2 rooms, an Airbnb might work out cheaper!).
For the vehicle: Yes, you can drive with your French license! I often use Autoeurope or go directly to the rental company’s site. You book and pay for the rental online ahead of time, so when you arrive, all you have to do is pick up the vehicle.
A few tips:
Plan for plenty of space for 5 people + luggage
Some companies don’t charge for an additional driver if it’s the spouse of the main driver (Alamo, Avis, or Budget, for example)
More and more, they ask for a credit card when picking up the vehicle—these are what we call in France "cartes à débit différé" (deferred debit cards)
I’ve done about fifteen trips to the US, whether road trips or stays. You really don’t need to go through a travel agency or anything like that unless you want a quick, "all-inclusive" solution—but it’ll also be more expensive. I love this planning stage; it already makes me feel like I’m traveling. And honestly, with the tools we have today, it’s super easy to fine-tune a custom route that fits you perfectly. 😉