The belts signify differing levels of expertise and experience. Everyone starts out a white belt, and through training and dedication progresses through Blue, Purple, Brown and Black.
BJJ has consistently proven to be one of the most effective arts for self-defense. It is no coincidence that many elite BJJ players have also found success in MMA.
There are classes or open mat every day except Sunday. See the full schedule here
You can train as often as you want. The more often you train, the quicker you will progress.
You can take a free trial class without purchasing a Gi, but if you commit to BJJ you will need to eventually make a purchase.
This varies depending upon students' other commitments. An average would probably be around 10-12.
Each class usually comprises 15 min warm-up, 45 min instruction and then 30+ min rolling.