Parakeets?????????????

Hi everybody! I am a 13 year old girl, and I will be getting a parakeet in a month.
I will be going to a local bird shop (ALMOST would have to go to PetSmart if I had not found out about this place!) that gets all their birds from local breeders and makes sure they are healthy.
We already know everything we are going to get, except the bird(s) of course, we have to see which one(s) I fall in love it (probably going to be a white or/and a blue one though, I just always fall in love with those!)!
My question is, should I get one parakeet or two? I want to train my parakeet, maybe even to talk, and I heard that you can’t do that if you have more than one. I know that they live in flocks in the wild though, and I don’t want to have a sad parakeet. My mom is probably fine with two, I’m buying my parakeet(s) with my own money. So I just have to decide. It’s the bird before what I want.
My next question is, should I get their wings clipped? I think they clip them at the store, but once they molt and their feathers will come back, should I clip them again? I would feel guilty because I took away the ability to fly from an animal that is meant to fly (I am HUGE on animal rights, and want to be a vet for practically all animals when I grow up). But I still want a happy, healthy, and SAFE bird.
Can parakeets be kept outside under the proper conditions (not too hot, not too cold)? I live in an area with practically perfect weather, and we might keep the birds outside during the day and inside during the night. If they can’t be kept outside I can definitely work something out with my family. If we have to, we will build a little enclosure around the bird cage so nothing unpleasant (weather wise) will affect them.
Sorry for such a long question everybody! Thank you so much for helping me! (: