I think since you are starting out and still in college, I would go with an adult or adolesent dog. It doesn't matter weather it's purebred or not. go to a rescue group who does fostering. Tell them what you are looking for and they will find your perfect pet.
But if you are truely set on purebred, find a reputable breeder and see if they have older pups for sale or even retired show dogs up for sale.
I do not think a puppy would fit your lifestyle from what you described. (Maybe later on when you are wiser and older and have enough time for a puppy you can look into getting a puppy.) Puppy are work work work work and they will not just sit around like you want.
Also, yorkies and poodles though they don't shed as much have a high grooming need. Their coats constantly grows and you have to brush/comb them and cut them all the time. And a friend of mine has a toy poodle and they are balls of energy. And yorkies, though I've never met one in person are part of hte terrier group and terriers are known for the abundance of energy. A simple long walk will not give these guys their exercise.
I don't know much about maltese so I can't comment there. But here is my opinion.
Retired show dog
-able to control their energy but they are going to need more then a long walk.
-already house trained (a puppy may or may not learn fast enough to do their buisness outside and you will have loads of accedents to clean up after.)
-comes with commands (unlike a puppy who will only have doggy manners will not know to come when called. Will not know how to sit or give paw or lay down.)
-bragging rights (think about it, you can brag how your dog has points in what shows and brag brag brag, but make sure you give credit to your breeder because they did the work in winning shows.)
Take me. I will be moving soon and I am already on a breeder's waiting list. (I'm in the top 5, but after adopting Kuma my recent rescue, I'm debating if I should take a retried show dog instead of a puppy. I got spoiled with Kuma because he came house trained and came with the command SIT. It's true he wasn't a show dog, but I liked that all I had ot show him is where he HAD to go and he never did anything in the house. (except one time, but that's because hubby forgot to take him out to do his buisness.)
Where as, I have to house train the puppy and have to clean up after their accedents, plus I won't be garenteed the puppy will learn in 1 week or 1 month or more to be house trained.
and the boundless energy puppies have. It's exhausting. (I have puppy fever righ tnow because my sister has got a puppy and I was just visiting and man I got burnt out very quickly.)
So, I think you should first look for a rescue group who does fostering and find out if they have a dog who has minimum shedding, moderetly low energy needs, and a lazy bug who LOVES to be cuddled all day and all long.