Can you find and launch the program named Apple System Profiler? That should tell you everything you need to know.
By the way, in the future, if you start a thread, put a little more detail into the title, e.g., "How do I know my processor speed?" instead of simply "need help". That way, people who know something about the topic will be most likely to read it, and people who don't or aren't interested will know to skip it. Thanks.