Beginning mobile java programming

I'm gonna try developing a mobile application, that should be runnable on most modern cellphones. If I'm not misinformed, most of these cellphones run symbian, and symbian runs java, so far so good?

I don't know Java, but I know C# and various other languages, so that shouldn't be a problem.
Where would you suggest I get started?
Do I use the Java SDK?
Should I use Eclipse?
Assuming that java on symbian is somehow customised to a mobilephones limited cpu/memory, somehow the development must be different from "ordinary" java development.

My learning stile favors starting with a simple example and building what I want from there (not learning all the theory first and getting it "right" from the beginning), so any links to a "Hello World" tutorial/sample would be appreciated. :)
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letharionAsked:
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Kevin CrossChief Technology OfficerCommented:
See if these previously answered questions help -

http:/Q_23868022.html --> I need to develop a Java program on a PDA, where and how to start?

Samples are at this link:
http://www.netbeans.org/kb/trails/mobility.html

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letharionAuthor Commented:
Looks like what I need. Just one more thing, how new/old mobile phones run java me?
Kevin CrossChief Technology OfficerCommented:
Think as long as you have a Java enabled phone this works fine.
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