If you'd like to toast your nuts, just add them to a dry skillet over medium heat and cook until fragrant, about 5 - 6 minutes, stir frequently.
You can use your microwave to melt the chocolate. Using a microwave safe bowl, add the chocolate, heat for 1 minute to start, remove from the microwave, stir and heat in 15 - 20 second intervals until completely melted and smooth.