Subject line is vauge, there have been many scrolls written on order to read books already.
Your actual question is vauge as well.
Do you want to know time order of event reading plan?
Many consider this a bad idea as books written after the first often relie on people having read the first. IAE WotC does/did maintain a timelime FR date to each book.
Do you mean which series is best to first read to learn the realms?
This clearly is also a matter of opinion.
I clearly hope you are not asking the correct order of any one series.
"Small beings can have small wisdom," the dragon said. "And small wise beings are better than small fools. Listen: Wisdom is caring for afterwards." "Caring for afterwards ...? Ker repeated this without understanding. "After action, afterwards," the dragon said. "Choose the afterwards first, then the action. Fools choose action first." "Judgement" copyright 2003 by Elizabeth Moon