I'm really new at this.... and I'm wondering about POA. Does it cost money to get one and do I have to go through an attorney?

I did mine on line-cost was $35.00 and it is legal.

Another alternative is a legal forms web site. I used one and the forms were very inexpensive - they also keep your records on file and you can download additional copies for free.
Use a reputable site that has updated forms for your state. Also, when you do complete the forms, pay close attention to the filing details. Some things need to be notarized others witnessed. Some states ask you to file a copy at the county/city court house. Overall, I found it very easy to use.
Print out several offical copies and have each signed and notarized. (every doctor, hospital, and financial institution will want their own copy on file.)
good luck

Yes you need a attorney,it doesn't cost much and the person needs to be willing to give it to you,it can be revoked if questioned.