I wont even suggest a new thread from a newbie account especially if we are talking about good and trusted gambling sites. Did you check the thread before suggest it? Did you read my comment on the thread you suggest for OP?
I think you are right, it is hard to build trust with a new build gambling site. Probably it takes a year(s) before someone else trust.
I would prefer if that site even 6 months old from the date of launching. However, there's a lot out there manage by reputed managers like Hhampuz, yahoo, and Darkstar_. Do your own research and it will lessen your risk to choose gambling site.