How do I flavour/turn the vodkas into something else ?
There are now many commercial flavourings available, which turn vodka or neutral alcohol into pretty decent gin or whiskey, or all manor of liqueurs. See the commercial sites, like Des Zines http://homepages.ihug.co.nz/~topkiwi or Ray Toms http://moonshine.co.nz/ for details. Or you can soak it with oak chips and make whiskey, or soak fruits in it to make your own liqueurs. There are many websites describing how to make liqueurs – see http://homedistiller.org/liqueurs.htm or http://www.guntheranderson.com for a starting point.