Bladder Infection in Puppy?

Hi guys. I got a new 8 week old chocolate lab on Friday. I know that they have limited control of their bladders, but it seems like she has to urinate sometimes every 15 or 30 minutes. She also usually urinates 2 or 3 times when I take her out. It's making it hard to house train because we can't possibly let her out every 15 minutes, you know? I did some internet searching and reading and found that a bladder or UTI infection may be causing this...

Anyone have any experience with puppy bladder infections? What are the treatments? How much does a vet visit and treatments cost (in your experience... i'd just like to know so I can be prepared)?

Thank you!