finding rpm depencies
 

how can i get info on a installed rpm s depencies which packages need to install it?

rpm -q --requires packagename

Read man rpm...

one more question is there a way to list rpm packages by their install date firt install goes first on the list?

rpm -qa --last
this will put the most recent on top so you will have to read upsidedown.
Did you bother to read the manpage? It took me all of 30 seconds to find the answer to both your questions.