Bloomberg Law
The easiest way to find legal ethics materials on Bloomberg Law is to visit their Legal Ethics and Professional Responsibility Practice Center at this link. Note that you'll have to log in with your Bloomberg login and password before you can view these materials. In the Practice Center you'll find a curated selection of legal ethics-related resources, including the ABA/Bloomberg Law Lawyers' Manual on Professional Conduct, ABA and state legal ethics opinions, current news, and recommended secondary sources and practice guides.
If the Practice Center doesn't have what you need, you can expand your search by returning to the Bloomberg Law home page and clicking on the "Select Sources" link to the right of the search bar, then typing "ethics" or "conduct" in the keyword search box and selecting a source from the list. Bloomberg Law provides access to decisions by many state bar professional ethics advisory committees. Note that there is no easy way to narrow your search to all ethics materials - you must select one source at a time or browse through thousands of sources.
For search help, try this guide from the Indiana University at Bloomington School of Law.
Westlaw
To find the full text of various model codes and books:
To find case law or journal articles:
For search help, visit Westlaw's searching guide pages here and here or try this guide from the Indiana University at Bloomington School of Law.
Lexis Plus
Lexis Plus offers the full text of all the ABA Model Rules and codes. To find them, as well as any other legal ethics materials on Lexis:
For search help, visit Lexis's help pages here or try this guide from the Indiana University at Bloomington School of Law.