1. When you open the application, it reverts to whatever you were typing before...
This is Lions' resume feature. To avoid it you can close all windows before quitting, hold option down when quitting, hold shift down when launching, or uncheck the box "Restore windows..." in System Preferences, General.
2. There is no "save as" under File. Just "save". Again, why change this?
Use "Duplicate". This will make a copy which you can name when you choose to save it.
Haha, yes glankrudolph, there is many a long-running thread on just this topic.
This might help:
And these might not...