The SPCA would be a great place, but yes, you really need to learn more about cavy's(guinea pigs)
Well, first off, never get a piggie at a breeder or petstores. They are unhealthy, mistreated, and there are way too many piggies out there that lose there life because someone buys a piggie instead of adopting. Next I woul suggest learning about their nutrition. Hers a great nutrition chart showing all the food piggie can eat and how much:
http://www.guineapigcages.com/forum/...arts-info.html
Cavy's need at least 1 cup of veggies a day. They also always need pellets and hay. Hay should be unlimited, but depending on the age of your pig, the pellets may need to be limited. If your guinea pig is 6 months or younger, they need unlimited pellets. Older than 6 months and the piggie should only have about 1/8th cup a day.
Also, the best thing you can do to learn more about guinea pigs is to read all the stickies (the blue links above each forum) and to ask as many questions as you can. Everyone here is so helpful and nice. We all have a guinea pigs best needs at heart.
I would also strongly suggest talking with your parents about guinea pig care and make sure before you make any decisions, that they are 100% willing to pay for ANY vet bills, no matter how expensive. If they don't like that, then I would
not get a cavy. You can't sacrafice you pets health.
To learn more about piggie health and care, take a look at guinea Lynx:
Guinea Lynx :: A Medical and Care Guide for Your Guinea Pig
Read up everything, it will really really help.
Just so you know, piggies need their nails clipped. I hope this helps!