So DNA is a long string, with certain identified parts that have meaning (code for something we know).  What would a layman like myself need to get myself to a hello world program that could take an actual DNA string(file) as input and give a hello for the presence an actual known gene? Not code-wise, that's obvious. I'm asking where I could get a sample genome, information about a gene, fill in the gaps of my understanding, etc.  Anyone know?