Welcome to EH-Net,
If money is no object ;-), then buying everything is a great way to go. But for most, we don't have that luxury. Search our forums for "vmware" and "virtual lab" and you'll find some good advice for practicing at home. If you have more specific questions after that, let us know.
Be sure to share your CPTS experiences with us as you go through your studies, the course and the exam.
CISSP, MCSE, CSTA, Security+ SME