Are there a lot of different birds and other creatures to take pictures ? Where are the best spots for birding ? Is it safe to bring cameras there?

Yes there are many different kinds of birds, and it is safe to bring a camera. Praries are the best places for bird watching. https://www.fws.gov/refuge/Okefenokee/wildlife_and_habitat/index.html

Yes you can bring cameras and I only saw one bird a blue harring mostly alligators there

Yes plenty of wildlife from alligators to spiders. The birds I encountered were mostly water birds from heron to ducks as I spent most of my time near the tour boat docking area.