Thanks Guys for the Reply. In terms of Credibility of a project, does it need to be posted by well ranked member here or Lower Rank Members like newbies will do?
That'a good question. Personally, to post announcement I think it would be best to use your official account which also wil be used for further communication. But since you are newbie, you need to buy Copper membership if you want to post images (I'm sure you want).
Another option - hire high ranked member to post ANN thread. But you need to find member with good reputation. If member who posted your ANN will get red trust rating, it wont give good image to your project. And hiring one of forum members can give you little inconvenience when you will want to update Announcement post because only user who posted it can update that post.
And one thing that you need to know - don't try to buy farmed account to post your announcement