Well , u need some trades before ppl start to trust u , for example i do trades since early 2005 and i know how it works , even tho i'm not so old user of this forum . But after 30-40 trades ppl start to trust you and you can do trades smoothly .
Basicly anyone if he has attention to scam , can make new account and say : I sell X of something , claiming he will send it after the buyer sends him the $ . But anyway there is another way to avoid also this kind of treats but this is for advanced users . I can't advice you anything since the adena is yours , but for example if i want to buy your adena , with your reputation (0) i will never send first the money . Cheers .