This can be a fairly complex topic - the standards or thresholds for various metrics can vary widely based on business needs, the desires of the end users, and so forth.
There is some information available on the web about what some of these metrics mean and what may be "optimal" values, for example:
Monitoring Disk Queue Length
The above article from Microsoft suggests that it is desirable for the average Disk Queue Length to be equal to or less than the number of active disks.
For something like CPU Usage, there are a number of things to consider -- there are some who have the perception that "lower is better" when it comes to CPU Usage, and a customer may wish to ensure plenty of room for future expansion by keeping usage low on their servers in the range of 20-30%. However, another customer may be more concerned with using their equipment efficiently, and would desire to keep the CPU usage above 80% but below 99% (This is perhaps analogous to buying a machine which can produce 100 widgets per hour - if you're limiting it to producing 20-30 widgets/hour you're not using the capacity you've paid for.)
Here is another article which discusses the impact of things like pages/sec with regard to memory usage - as you can see it's a fairly complex topic and not something that lends itself easily to "standard" values.
You might also be interested in this thread.