You're welcome merdogan. Let me explain the difference:
"From now on" means beginning at the moment and continuing forever.
"In advance" means "beforehand".
So, if you use "from now on", the meaning becomes "ÅŸu andan itibaren (ve sonsuza kadar) iyi okumalar". Yet, when using "in advance", then the meaning becomes "ÅŸimdiden iyi okumalar".