A great place to track goings on is through Bloomberg's web site. The market for municipal bonds is very large and calls for analysts, municipal advisors and traders. Positions in public finance are usually difficult to obtain but offer high rewards. Persons with previous experience in public administration would be attractive to investment banks in this capacity. A major growth area in municipals is in the project finance area.
Some brokers specialize in high net worth individuals while others span a variety of clients.
Try to start with a firm like Merrill Lynch that has a good training program. A good web page to look at if you are interested in being a broker is the Syndicate. In institutional sales you would be responsible for conveying information about particular securities to institutional investors. You would be likely to have heavy contact with portfolio managers and your own firm's analysts and traders. Sales skills and product knowledge are crucial in this area as is the ability to get through to busy institutional investors.