Welcome to the forum. Sounds like you have a lot of reading to do before ever considering the addition of fish to your tank.
Flourite merely needs to be rinsed and then you can add it to your tank.
Livestock should not be added to your tank until you have completed an initial cycle. Check out some of the posts about the fishless cycle for details.
The type of filter you need depends upon your tank size and the type of livestock you plan to keep.