Hello and welcome to the Void.

I noticed you joined less then half an hour so you may not be able to post in any other sections until the forum clarifies your new account.
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I'll just answer a few of your questions...

So i will post my work in appropriate section
Showcase Arena

Are we allowed to post a pic of our self here?
You can post up a picture of yourself here: The Void->Faces of GFXVoid

How to put a the horizontal line image in our signature???
 This can be changed by going to the top of the page and on the horizontal bar you can click "Quick Links". Then Select "Edit Signature". There isn't really a max limit, but we do ask it to be reasonable... so no massive file size gifs or an excessive list of signature images if that's ok.

Can anybody open an account on deviant art??
Yes. I have one if you click the link in my sig below. It's just another graphics site that people are allowed to join. Deviant art is a site dedicated to displaying artworks and resources We don't have a problem to people linking their DA account as it can act as a port folio, but we do like to see people post up an image of whatever artwork they recently rather then a new thread and just alone link members and viewers to another site.

We don't have anything against linking artworks, but some people may not want to chase around the internet to view your art, so you may not be getting the comment, criticism, and ideas that some people may be able to offer.
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I do believe I covered everything. If you have any more questions feel free to ask any of the mods. We either have a Blue or Pink name.

Hope that helps and enjoy the Void.