My question is: is this a step in the right direction? Are there any issues that the songs have in common? Do the vocal efx work for you? Can you understand everything that's being said? What can be done to achieve a more professional sound?
My opinion would be that a step in the right direction, would be to create your own tracks. Acheiving a "professional sound" is really impossible to answer. Willy Nelson sold tons of records with a very basic sound, other recordings have spent months and millions of dollars in commercial studios. The vocal you recorded sounds OK, there isnt anything else to comment on.