I highly recommend you pick up this book:
Digital Portrait Photography: Art, Business & Style (A Lark Photography Book): Steve Sint: 9781600593352: Amazon.com: Books
It's only $12, and LOADED with great info about portrait photography. I'm talking 200+ large, easy-to-understand pages loaded with full-color images and examples. The equipment section is a bit outdated because the last copyright date was 2009, but the advice about everything else is sound.
Since Amazon doesn't let you have a look inside the book at all, I'll list the chapter titles from my copy:
- Portrait Psychology
- Framing
- Lighting Basics
- Advanced Lighting
- Using Lights
- Posing the Face
- Posing the Body
- Minimalist Makeup
- Equipment
- The Business Side of Portraiture
You will learn boatloads of info from this book. Definitely give it a look.