If you're reading this, I assume you are interested in the theoretical transformation of a relatively weak alcoholic mixture into a relatively strong alcoholic mixture. That is, the distillation of whisky.
If you are just interested in creating your own alcoholic drinks from scratch, then I recommend starting with brewing beer (LINK). It's cheaper, easier, and less likely to be illegal in you area.
If you don't know about the early stages of whisky distillation, here is a quick round-up:
Take some grain, and allow it to sprout. Just as it starts to sprout, quickly kill it by drying. It is now a "malted grain". Mix the malted grain with hot water and stir until you get bored - you are dissolving the sugars from the grain into the water. Filter out the solids, and add yeast. Keep the mixture slightly warm (and sealed from the air) until the yeast has turned the sugar into alcohol. You now have a wash that is ready to be distilled. Apparently, the wash has a strength and taste similar to beer, so maybe you would like to start there.
Distillation is the process of separating a mixture of liquids with different boiling points. In this case, we're trying to separate ethanol (alcohol) from water. Pure ethanol boils at 78.4oC, and pure water boils at 100oC, so heating the wash will make the ethanol boil off first.