IMO no-one will be able to answer this question for you personally as if you ask 20 different golfers they will all feel the weight shift differently. Some dont think about it (Shootin), others (like myself) like to stand on my left foot and drive my hands down , some feel it as right shoulder down/left shoulder up

Is it a weight shift which drives the arms or the arms that drive the weight shift? This is all milli second stuff and I think the best way to find out what works is just hitting balls. Try feeling lower body first, or shoulders, or chest, or feet or hands .. and when you find something that works for you realise this is the right feeling for you. Make sure your method isnt OTT and your hitting it well and stick with it. Dont then read something else in a magazine or a book or a forum message and screw yourself up. I wish I'd taken that advice a few years ago but I learnt the hard way