Cant figure out beginner assignment, need help $

Reasonable Computers Corporation would like an applet to calculate the cost of adding peripherals to a basic computer system. Use at least 6 single check boxes for various types of peripheral devices, including printers, monitors, modems, and other devices with which you are familiar. Assume a basic computer system price of 575$ and then add appropriate prices based on user checks. Add a button that tells the program to perform the calculation and display the final price. Try various width and height values in your HTML code to help align components. I'm kinda desperate here. My car was stolen along with my schoolbooks so I have not been able to study. This is only for me to study off of and help me catch back up..