New trees in bags are usually 2 years old. They generally had their "main header" cut the first year, forming several "branches" below that cut.
Q-1: "I" always prune for an eventual "open vase" tree. There is also the "central leader" design...
With the varieties you listed I'd not hesitate to train them to the open structure. If you decide to do this you will need to maintain a balance between the "limbs" I described. I let my young trees grow wild their first year with me (just like kids) - but, if any of those future limbs become too aggressive, or dominant - pinch out their tip! That'll teach 'em!
It's best the limbs grow at a similar rate and size; if one becomes too dominate it will again become a "main header," and defeat that prior heading job. You can also pinch out the tip-growth of any other shoot competing with those "branches," and do snip off anything coming from below
the graft union.
Q-2: Save your "real pruning" for February... Someone may guide you to some first year pruning advice, it should be easy to find; but here's mine. Leave the branches, snip the rest!
You may also want to "aim" the branches; bending them with string or spreader-sticks to establish the "perfect" angle. You've plenty of time to ponder!
Q-3, 4, & 5: If you've got these trees "healed-in" for this season - leave them in until... February
before transplanting to their permanent locations. Your home soil will ultimately become theirs. I'd always amend the planting hole, but have realized over the years that the roots will spread far beyond "that" hole, and you're kinda stuck with what you've got soil wise. They all like sun
all they can get!
Take your time, keep them watered and protected, watch for hungry caterpillars (and deer), and do your homework. ...I just noticed that "4 in one" apple tree listed... Hadn't we discussed those earlier? Do watch that no one limb (i.e. golden delicious) gets away, or becomes dominate. Just tip-pinch it back as described above. And the only problem I see is the peach
... but we've all got to try to grow at least one peach tree~ I was a slow learner - it took me four of them to realize they don't like my neighborhood