game like dofus-arena...

hi,
can i know what i should know in order to develop a game such as [dofus-arena]?

1. what i should learn in order to make game such as [dofus-arena] type?
2. is it hard to make such game?
3. program that i need?
4. time? will it take a long time in order to do so? i know this kind of question is kinda hard to answer... just tell me ur opinion will do so... >.<

please help me out with those question...
thanks i appreciate it
and SORRY for the trouble

ohh ok thanks ^^
i will get myself into programming when i find myself some good books ^^
anyone around here might feel like giving me a help on learning those programming language ?

thanks and sorry for the trouble