What I mostly do is just open a command prompt and then I type perfmon.msc. That gives me the performance monitor. Then I create a Data Collector set, with the counters I need. But after that analyzing the data collector log is the harder part.

I wrote a blog article about analyzing performance logs on my own blog, it's here for your reference (and also a description which counter is used for what): Key Performance Counters and their thresholds for Windows Server (suggested by Microsoft). There are a lot of counters you can use, and there also some templates. Those templates are inside the PAL tool (Performance Analysis of Logs): http://pal.codeplex.com/

This tool can also analyze the performance logs for you and give you a nice HTML formatted report. Of course you can always choose to not use this tool and analyze the peformance logs yourself.