I am just a newbie and I am trying to earn some, is this site legit?
You can get some btc from bitcointalk by participating signature campagin. But your account need to be mature. The more rank you get, the more BTC you can get.
But you need to note that this forum is not giving "free" bitcoins in the name of signature campaign. It is a reward for your hard work. You need to check games and round section for exact free bitcoins. But there also now people ask for some qualifying tasks. Unlike early days, free bitcoins are not now possible in bitcointalk.
Basically signature campaign is promoting their sites through hiring your signature and they are paying you for that. they pay you according to you rank. If you are rank is high so their payment for your signature is comparatively high as compare to the low ranks and that is also the reward of your work that you do in the form of posting about a topic.