Where do the coded messages for making proteins originate from?

If I'm reading your question correctly then I would say that they come from the DNA when it is transcripted into RNA. Then this mRNA is read in a process called translation by the ribosome-tRNA complex and amino acids start coming together as the mRNA is being read. These amino acids as you probably already know are building blocks for proteins and eventually a protein would result from the translation of the mRNA.