Sounds like you are making every effort to think this through and do your research. I know many adults (no offense, but you seem like a bright guy, I'm sure you know what I mean) that don't put this much thought into whether or not to get a pet.
I remember being a college student and keeping a bunny in my dorm since I couldn't have dogs and missed mine so much.
Also, my nephew loves animals and was never allowed to have any at home. When he went off to college he got an apartment with another student and promptly added two dogs to the arrangement. He is now graduated with job, and apartment and both dogs still happily living with him. I have had several conversations with him about quality pet food, grooming, choosing a vet. This guy took an interest and it would have been wrong to tell him to wait.
So, there are certainly those with the mentality to make having a dog while in college work.
As far as yorkies being too girly? Don't tell my husband that...
You need to check out some of Alaskayorkie's threads for pics/videos of yorkies being anything but.
Good luck and keep us posted.