Begin by taking a look at these slides, which cover the basics of covalent bonding. By the time you've completed them, you should be able to:
define covalent bonding
predict which elements are likely to form covalent bonds
draw electron diagrams representing covalent bonds
predict the name of a covalent compound after looking at the chemical formula
In the notepack for this topic, you will find practice problems for drawing electron diagrams for covalent bonds (p17-18) and naming ionic compounds (p19-21). Give them a try!
Use the online application and accompanying worksheets to further study the ideas of covalent bonding.