Why not go check some out and see for yourself? It will give you an idea of what to expect, and maybe give you time to work with your pup. You might be able to rent or borrow a horse to follow along, or you can walk.
https://webapps.akc.org/event-search/#/results
Keep in mind that your pup is really young, and if you enter a stake, he'll be competing with dogs up to 15 months old, which is a big difference in dog years. Not to say that some pups don't breathe fire and tear thingsup at an early age.
Some clubs put birds out for puppies, some don't. Some require shooting (.22 blank) over puppies if they have game contact, some don't. All require pups to handle reasonably, show some independence, and hunt. Bird contact and pointing are not required, and even though you're not supposed to get "extra credit" for that, it doesn't hurt.
Junior hunters basically have to handle reasonably, find and point birds, and hunt intelligently.
In trials, dogs are judged against each other and in tests, they are judged against a standard. So at a trial, you and your dog might have your best day ever, but get knocked out of contention because other dogs and handlers had a better day. At tests, you do the work adequately, and get a passing score, doesn't matter what anyone else does.
You asked how puppy stakes relate to completing FT. Do you mean what's required in competition, or what does a puupy stake mean as far as attaining a FC ( Field Champion)?
You need 10 points total to get the tile FC, and points are decided by how many dogs are competing in a stake. You can use only 2 points from puppy stakes toward the title, another 2 from derby, and the rest from adult stakes including a stake called a major, which is 3 or more points.
Confusing, I know
And the AKC site doesn't make it any easier, does it? That's why you should visit some events and talk to people there.
Good luck and have fun.