Since you already have a snake, and your mom "is not really into snake care", it is your responsibility to provide for the animal. You did a good thing by coming here for advice, but you won't take ANY advice from the many many experienced people who have tryed to give it to you.
I got my first snake when I was 13. The difference between you and me is, I saved up my money for months, along with months of research. I also don't get allowance, but I did chores around my house and my family's houses for money. My mom wasn't thrilled about me getting a snake either, but both of my parents have always had pets, and they know how important it is to take care of them properly. Also, since my mom found out that I was really into this, she has warmed up to the idea of me having snakes, and even enjoys holding them.
I didn't find this site until I had had my snake Nina for about 5 months. I asked questions, LISTENED to the adivce I got, and fixed my setup so it was the best possible environment for my snake. I now babysit for a job, and spend most of my money on my animals. Heck, I'm only 16, and just look at my signature to see how many animals I have. I ask any quetions I have to experienced people, I take their advice, and I think I do a pretty dang good job of caring for all my pets.
A lot of websites out there don't have good info on caring for corn snakes. Any info you have gained in the last 3 months may not be right, so you should keep an open mind in order to take care of your snake.
I love this hobby, and I'm going to do it for the rest of my life. If you want to have snakes/reptiles/any pet for that matter, you need to take advice of people who know what they are talking about. Everyone here is just trying to help you.