Well I'm not usa based mark but for direct investment in corporate bonds talk to your stockbroker (if you don't yet have one they should be happy to have an initial chat about services offered including a list of bonds,the yield (interest rate)and credit rating)
Another alternative if you feel uncomfortable with direct selection is a bond fund these are available from mutual funds groups and is a safer option as your money will be spread between differant issues,try and find a no initial charge fund as your only investing for a short period