It's always good to have a dream!
This process (preparing for the DAT and applying to dental school) is extremely expensive. The sooner you warm up to this concept, the less painful it'll be for you to spend all that money on it.
There aren't many useful resources out there that go for a cheap price. Look at some of the useful resources people have used, and you'll find out that everyone has paid a good amount of money for them (Example: DAT Destroyer, CDP, etc.).
Some of the cheapest resources, however, are the Cliffs books. Their AP biology runs for about 11$ on Amazon, and it's a great resource for DAT's biology.
Chads Gen Chem videos helped. You can get that off the internet. Someone above mentioned the DAT on the ADA website. Hmm I think that is it really. Some people may have a link to a pdf of the AP Bio Cliffs. Thats all i know..