Finally I decided to activate Akismet on my blog after got API Key, and there it is working beautifully.
The other plugins suggested by Jim, I installed the Subscribe Comments and Twitter Tools. The Google Analytics I have installed.
After analyzing the plugin Twitter Tools, which requires several steps to be running well, I decided to disable because I prefer to continue using the iticker to have twitter feed in my the blog. I recognize the potential in Twitter Tools, but I like the visual effect of iticker.
I research other plugins, and found a nice photo gallery plugin, NextGEN Gallery, but for now not install , maybe later,
Soon maybe install new plugins, and possibly a new theme, but for now, no more changes.