You need to revise your profile and edit it. The first line of your profile states that you "usually" try to provide 100% accurate work.
I'd help you write your profile but I think it's only fair clients should see a true reflection of the freelancer's ability to write.
Do a little research and try to construct, punctuate and reword your profile better.
Sofiastein: welcome to oDesk.
re: "Do clients contact me first?"
You are new, with no track record. No client with a legitimate job is going to contact you.
re: "...or must I look for opportunities?"
Yes. You will need to apply to jobs. Before you do so, however, I want to you spend at least 12 hours reading through various community forum threads in an effort to learn more about oDesk. You are currently not ready to apply for jobs.
re: "Can I be pay paid via Western Union"
I don't think so.
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