Typically, one should employ the same controls for safeguarding information that you apply to all other customers. One key is to ensure that the marketing promotions are not more or less favorable to a particular group or class, especially if it is credit-related.
At a previous bank, we experienced some adverse reaction to some of our hispanic marketing as the individuals targeted did not want to be labeled as spanish-speaking. Be sure to do your due diligence on existing customers that you target any marketing to. For general hispanic marketing initiatives, there are a number of lists one can purchase or online resources that can be found to provide a good pool of potential customers. Also, if the advertising is going to be done through the internet, make the english and spanish versions of the websites as similar as possible to avoid any potential weankesses/issues from an availability and/or product presentation standpoint.