I got the lex file to compile and work for the small program to add two integers. I must say the flex script isn't really flexible at the moment, and really, it is the hardcore 0th level in which you can get Goal 1 done, but I can say that goal 1 has been done. Now, I will try to build upon the code to improve the lexical analysis, and hopefully will get a good working parser in the coming weeks. Comments on the work are welcome, especially for those who are following the project.
The lex source code is posted here