You should just do a forum search on the topics you wish to learn more about.
The red dots under your vcash total is your rep bar. You are awarded positive reputation for good posts, funny posts, contributing to the community, etc. You are given negative rep for bad posts, retarded comments, and flaming/trolling. As of now you have negative 5400 rep points. that is why the bar is red, once you have a positive amount of rep points the bar will turn green. You do however have the option of turning your rep system off. To do so go to the top left of the site and click on "user cp" that is your controll panel where you can modify certain features of the site (rep system/profanity filter/etc).
vCash is just a fake currency to use for bets that will be posted through out the year. To see if there are any available bets to get in on go to the red navigation bar at the top of the page (where user cp is) and click on BP book. from there you can wager vCash.
When you give someone positive or negative rep that does not affect the total of vcash they have. I hope I have helped out a little. If there is more that you need to know I would suggest using the site's search feature and search for the most relevant word in the desired topic.