Information on trees can be found in several places:
First, head to the Pasco County website
Tree Preservation and Replacement document
To remove a tree, depending on size, you might need a permit.
Pasco County has a website of Florida Native plants and trees that you can plant on your property.
Also, check out the community documents which contain additional information regarding trees. There are two documents, the Covenants, and the DRB Supplement.