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The first two questions can and should be done using just your mind and a calculator.
Use the HR Diagram Explorer to complete the rest of the assignment.
Some notes about the linked tool for those interested in the finer details:
The main sequence is defined as the location of stars that are burning hydrogen in the center of the core. The main sequence has no formal, official mathematical definition. Using the Hipparcos data, a curve was fit to the data. This is an approximation since the main sequence has finite thickness. It is more a strip than a line.
The location of supergiants, giants, and white dwarfs also have no official definitions. The region represented by the module is an approximation.
The conversion between B-V color index, temperature, and spectral type are not precisely one-to-one conversions. Spectral type, for example, does not have the same resolution as B-V color index. Since most of the data was given in spectral type, some binning occurs in the star data.