If at first you don't succeed, smash the forum with more spam, surely people did not see your original message and you instead of finding answers are just sitting there with your hand near the groin region awaiting for them. In that case, let me just repeat myself, again, for your sole convenience, from thread http://forum.bitcoin.org/index.php?topic=14277
It's ok guys, I got this newbie, don't worry, I won't lash out on him... let me write up my reply...https://mtgox.com/
-- go to the homepage of the site your are referring to. Read the first paragraph:
Mt Gox is an exchange. It allows you to trade US Dollars (USD) for Bitcoins (BTC) or Bitcoins for US Dollars with other Mt Gox users. You set the price you want to buy or sell your BTC for.
This answers your first two questions. From the first paragraph!https://mtgox.com/trade
-- this is a page that shows the buy and sell forms, you don't need to log in to see it, and it appears on the menu after you navigate from the homepage. It also states this:
Mt Gox charges a small fee (0.65%) for each trade.
There, now you know how mtgox gets paid.https://mtgox.com/users/addFunds
-- What about paypal and trust? Well there is no paypal here, you need to use serious banking services, like banks, Liberty Reserve, checks or cash.
All questions answered by simply visiting the website for two minutes, instead of making a thread and waiting for hours for the answers to magically get delivered. How amazing is this thing called a forum!!! I'm assuming you heard about mt.gox but don't know the address, otherwise you would have different questions, definitely harder and complex question than what is this website that explains itself in the first paragraph! In that case, the address is again: www.mtgox.com