From Verona to Madonna di Campiglio you can catch a bus to Trento. The latter runs five times a day. The fare from Trento is EUR 8 and from Verona EUR 30. From Verona by car, take the A22/E45.
Another question is how to get to Madonna di Campiglio from Milan. The journey takes just over three hours. During the winter season a direct bus runs once a day from the city to the resort for 12 EUR. Once a week there is a direct ski-bus from the airport directly to the resort. By car you can take the A35 highway.
There is a bus from Bergamo airport for 36 EUR. During high season there is also a shuttle-bus service between Madonna di Campiglio and the nearest resort Pinzolo.
