Don't make it more complicated than it needs to be.
combine water and sugar in a 1:1 ratio, and heat it until it just barely boils.
Stir it until the last of the sugar disolves. Store it in the fridge.
I use one Cup of water and one Cup of sugar in a glass measuring cup, then microwave on high for two minutes. Then stir until the sugar is fully disoleved.
That's it.