Finally getting into OS X

Just recently ordered a 2012 13 inch Macbook Air for $1009. Thought it was a great deal so I pulled the trigger. Brand New. It hasn't arrived yet (Thursday). I only have a few questions.

1. Are there any specific programs I should use to keep my Mac running normal? Like on Windows I have CCleaner installed and Auslogics Disk Defrag. I was wondering if OS X needs some kind of maintenance like Windows or any tips you have to keep my mac running well.

2. Are there any recommended apps I should D/L? So far I have Sparrow in mind as a good mail client. Any other suggestions would be nice.

3. Any tips you guys have or web links that give a pretty good tutorial in learning how to use OS X.

Any other suggestions are appreciated.