Hello, Dale, and Welcome to Apple Discussions,
a) There's no way, since iTunes only sells AAC-files, either protected (m4p) at 128 kBit, or unprotected (m4a) at 256 kBit, these are marked with a +
b) You can directly convert iTunes Plus songs, by right-clicking and selecting "Converting to MP3" (if MP3 is the format you chose in the import preferences).
Normal iTunes songs are protected, and can only be burnt to an Audio CD, that you can then use like a normal one...
Hope this helps.