as far as the bellows goes, when I played some small pipes ( with belows) I found it was easier to remember to lift my arm up and squeeze by taking a breath and blowing it out as you would with a GHB.....if you can understand that ! but try this...
pretend your holding a GHB under your arm "air pipes" and start fingering a tune, and I bet you'll notice that your "bag arm" starts to squeeze, now pretend your blowing into the blowpipe.........did your bag arm raise up a little? bet a bag of chips it did! so just transfer that over to the bellows

every time you take a breath in pull your bellows arm out to fill it up, when you blow out squeeze the bellows.

give it a shot and let me know what happens

KFP