Okay ill try my best to answer the questions:
1) Points are gained from posting and making threads depending on size will determine how many you get.
2) You will see points come into this site abit more in a few more weeks they will be able to be used to buy advertising domains hosting and other related goods, right now you can go to uShop at the top of screen to spend them.
3) When you perform a sale with someone and all goes well you update there TR Trader Rank this is to tell others about the experiance youve had with them and abit like ebay so they know if to buy or sell to them.
4) Just like ebay's Trader Ranking but for ForumBay
5) You can donate points either for a helpfull post, someone has done something for you or you have sold them, Selling will come more into play when we recieve more members and make it a forum currency so its worth $
6) Not really sure on this one maybe to post on ForumBay
7) Read above someone took there time to help you out :-)