Back like 6 years ago, my dad had 2 Nurse Sharks, 2 Leopard Sharks, and an Atlantic Stingray, in a 225 gallon tank (at different times though),
I sincerely hope so. That tank is too small to begin with, and I don't even want to think about it being stocked with more than one of these to boot.
I wanna get sharks now.
They are quite appealing - but are not easy, and have many more requirements than other fish.
So how big of a tank would I need, cause I want multiple species.
Multiple species in the same tank? Well even for the smallest ones (Bamboo Sharks), you will be needing several hundreds - to thousands of gallons to house "multiples". And if you want to mix them with other sharks, it only goes up from there. You need to be more specific, as "sharks" is not a catch-all, different species have different requirements.
So how big of a tank would I need for a common aquarium shark or ray?
There is no such thing as a common home aquarium shark/ray, as these animals are not exceedingly common in the home aquaria to begin with, however the most commonly seen sharks, within the small group of individuals who keep them are Brown Banded Bamboo, White Spotted Bamboo, Epaulette and Horn Sharks.
I am open to Fresh and Saltwater ones.
Well "close" that, because there are no true freshwater sharks. There are other freshwater fish which are nick-named "sharks" but they are bony fish and not members of the Elasmobranch classification.
So what I need is a list with, Common Name, Scientific Name, Minimum Tank Size, Somewhere in Chicagoland or on the Net I could by it, and estimated Price.
Well hun, first you need to do some homework and figure out your budget, the space you have available for a shark pond or large tank (as no matter which way you slice it, you will need at minimum, either a tank of several hundred gallons, or a small pond), the species you are hoping to keep, and what their basic requirements are. Though we have a lot of information we are willing to offer, you need to take some innitiative as well, and provide more specific questions, so that the answers you receive can be tailored to exactly what you are asking, and not broad spectrum, varying information. That will be the most beneficial to you.
A lot of basic information can be gained with a quick "google" or "yahoo" search, and will allow you to gain a better perspective of what you want to keep. Once you have some animals in mind, and an idea of what is feasible for you ($$$ wise, and space wise), and have more specific questions, post them up and I am sure several of us will be able to fill in all the blanks. 
Thank You.