Questions about security on OS X


Getting 10.1 is my first step into unix, and I want to run my own web page using apache... my only hesitation to this are security issues (not that anyone would want to hack in, but just in case). i don't totally feel comfortable about having a static IP address with a computer on all day and night that i use for my own person things.... does anyone have any advise about how to enhance/maintain security? books to read about unix?

thanks for the help