Great bike!
Provided your dealer set up the gears brakes etc properly, that side of it should be ok for now. After a month, book it in for a basic service as cables will have stretched and they will readjust it. Lots of dealers offer this first service free..?
Saddle height, angle and position and handlebar height, angle and position are all fairly subjective and what works for me won't necessarily for you. In general if you're starting out I would leave the handlebars as they are, and for the saddle, set it so that your legs are fairly, but not totally, straight when they are at the bottom of the pedal stroke, and have the saddle level, ie parallel to the ground, and in the middle of its fore-aft position range. You'll soon work out what if anything you want to change.