Try looking around at some other people's profiles that are in signature campaigns. Go through their post history and read a but. You will get a feeling what are good and quality posts and what are not. I think this is the best advice that you can get!
i will try to do that thanks
Seriously if you can't spell "CAMPAIGN" don't fucking join an English-language sig campaign.
yeah im not an english speaker, but i try to do my best, also it will improve my language
Nowdays campaigns screen their members before joining. You try posting without a signature and post in topics that interest you. As long as your post makes sense and is useful, the campaign may choose to accept/reject you depending on the quality. Mainly the posts should be on topic, useful and sensible. I would advise you to wait till you become a Full Member (2 months approx) and then join Bitmixer.
I will be checking about this, maybe i will try as a newbie, but if that dont work i will probably do what you are saying
Thanks for all the advices guys