For starters, Boot Camp is simply a glorified partitioning program that creates a separate space for you to install Windows and run it like you would on any other computer.
What you first need to do is download Boot Camp from Apple's website and then install it. Then go through the steps of creating a partition, burning a driver disc, restarting the computer, and installing Windows XP. You will need a valid Windows XP installation disc with no less than Service Pack 2. Once you have finished installing Windows, load it up and then pop in the driver disc that was created in Boot Camp's setup wizard. This should install drivers that will allow you to properly use all the hardware on your Mac.
Now if you have any external peripherals or accessories, you will have to find and install Windows drivers for them on your own. Remember, Windows under Boot Camp runs like Windows on regular computer.
Most software licenses only allow you to install the software on a single computer. Installing Windows via Boot Camp is essentially like adding a second computer, so you most likely won't be able to install a single copy on both. But if you plan on using the software solely in Windows, then you shouldn't have this problem. Just install it as you normally would.