It's hard to find a good signature for a Newbie !
maybe someone will prompt me where to look a signature or a good bounty? sites, groups?
What do you mean about a good signature for NEWBIE? Now, the Signature or Bounty Campaign manager has not accepted NEWBIE to join in his project. Can you change your question to, what should I do before join in the Signature or Bounty Campaign? it is a suitable question for you to say. For a lesson for you to join the Campaign you should often be in this subforum
https://bitcointalk.org/index.php?board=24.0 it will help you create a quality post. Having quality posts, criticisms and suggestions on threads you read will make it easier for you to apply to some Campaigns.