Starting an Investing or Forex Website

You're asking a complex question without giving us details of exactly what you want to provide. Putting up an investing web site can require different laws than putting up a web site about "how to play poker" and then providing affiliate links to casinos. Different services will provide different requirements, especially if you are promoting - I'm not sure exactly what that means and there can be a fine line between "promoting" and "giving advice." Disclaimers may help but may not be sufficient, depending upon what you are doing.