The 4th red dot - receipt is the ticket for the brigde , pay at the Danish side.
Your route from Tromsø will be as your plan shows has 2 ferries - without ferries you hav to ad 58 miles but the time will be the same. If your a bit unlucky the longer way will be much shorter in time. And ad to , that the long road is much better - legal speed will be 90 km/h for the most part and you ride 73 miles out to Tromsø and then this distance on the same road back again. If clear weather , you will have the evning sun on your left and that will be spectacular when climbing the mountains.
I would also advice to tank up often , in north of Sweden , use the bigger towns on the route. This is BARREN country - gasstations do not funkction all the time or even are open, Karesuando gas station (your last red dot) is open from 0700 and is 100 miles from the next station in Skibotn.