You can click on the Freelancers username and see their experience and profile. One of the catches with sites like these is that "new" Freelancers, like myself, may simply just be new to the website (again like me), or they may be new period. Don't discount new users; instead be specific in your request and pick the Freelancer/s that address your needs. I will now submit to the contest.
Freelancers will post questions like this here. "Can you provide more details about your project". You can then message them back with a response. I have found the response is also best added to the contest brief if it is relevant to everyone.