2D Plotting
Users are encouraged to read through the following primer: 2D Plotting Primer
Examples  Tutorials  MATLAB programs 

Plot a simple sine curve  plotting_sinecurve.m  
Plot multiple sine curves on one figure  plotting_sinecurves1.m plotting_sinecurves2.m 

Plot multiple sine curves on multiple figures (using subplot)  plotting_sinecurves3.m 
Other tips...
Type help plot at the command prompt to see a list of line types that can be used
The menus on the figure window can also be used to insert labels, legends, etc.