I'll add a local knowledge tidbit to what XMEDIC73 said...
His route is excellent, but there is the option to take Highway 11 north from North Bay; rather than 17 over the north shore of the lake.
Now 17 does have more scenery, and towns to stop in if needed, a few touristy places to stop (Agawa Crafts and the Canadian Carver near Pancake Bay, The Canada Goose in Wawa (oh and the Wawa General Store - try a pickle!), Winnie The Pooh memorial in White River) and did I mention scenery? However, it also has significantly more large hills you'll need to power up. Ahhh the "mountains" of Schriberia IYKYK
11 on the other hand, is quite a bit flatter, and many long-haul truckers and RVers use it to help conserve fuel. While technically longer in distance, interestingly it takes the same amount of time. Scenery however, consists of lots and lots (and lots) of northern boreal forest, and small logging and mining towns. There are some photo ops in Beardmore, Longlac, Hearst, and Kapuskasing.
In either case, remember to have a camera ready when you get to the Nipigon Bridge

A stop in Thunder Bay is worth it for a photo of the Sleeping Giant, and coffee a persian for dessert!
The stretch from Thunder Bay to Dryden can be a little slow - is 350km with only two small villages in between - Upsala & Ignace.