Flash and related software learning

Hi,
My name is Murugan.And i am trying to become a RIA developer.I chose to

go the Adobe way.So,first i learnt the AS3.0 core language with OOP

principles.I opened a few .as files and found them normal to understand

and follow.I already have some experience with Flash in creating some

(regrettable!) animations.I know all the basics of creating a Flash

based RIA.
After coming in to contact with Flash builder and Flex i

really like their straight forward simplicity in code management.

      Apart from AS3.0,Flash and Flash builder,if look around i see 

there are multiple technologies to learn to become a complete RIA

developer which incudes knowledge about server side technologies as

well.It’s true that i am a flexible person in learning anything anew in

a short span of time. But i want to spend my time reasonably in

learning only the necessary technologies which live within the

environment of Flash and Flex and are being used by most people who

develop RIAs.
And while proceeding to study the necessary new

technologies i want to land myself in a job with the available

skills.Are Actionscript3.0 along with FlashCS5 or Flex enough to get me

a job?.Or do i need to know anything more a bit.Why i am asking such a

question is that when i was going through many job requirement

advertisements by many concerns,under skills required category they

list so many technologies apart from the three i know.That really puts

me down(but not out).Really unnerving.
So,i hope anyone who goes through the above paragraphs

will understand what my problem is.Hoping for a reply.
I am a windows user.
rgds,
S.Murugan.