mRNA is read 5->3 
Start codons can vary depending on the cell/organism type although more generally for mRNA it is always: AUG which is always Methionine 
Stop codons for mRNA are: 
UAG ("amber") , UAA ("ochre"), UGA ("opal")
5'-uaucc.aug.gca.cuu.uaa.ac-3'
M-A-L
Methionine-Alanine-Leucine