Oh, dear God! Are you serious? Where does it start? If you have some delicious Wensleydale cheese, have some now. With a few crackers. Then think: the Camino Ingles. How did it get its name? I don't actually know, but I have gleaned this much: it concerns the name of the pilgrim route of those who landed from foreign shores speaking English, or anything that was neither Spanish, nor French, nor... other Continental languages.
So, back to your fair question. In modern times, there are two recognised starting places in Galicia. La Corunna and Ferrol. I have also gleaned that the first is the original, traditional. Who knows? I have been converted to cynicism as a result of my membership of this forum.
If you want to get a Compostela, find a 25km route in UK and prove that you walked it, then begin in La Corunna. Or else, get yourself to Ferrol. It exceeds the current requirement of 100km as minimum for a compostela.
Most of all, enjoy it. It is short, but contains the elements of pilgrimage. Which is what it is all about, isn't it!