Before you get started reading all the awesome resources you've found, check out this helpful guide: Guidelines on Reading Philosophy.
After learning those helpful tips, check out Guidelines on Writing a Philosophy Paper before starting your paper.
To browse philosophical subjects, browse these online encyclopedias to get some basic ideas about topics before moving on to in depth research:
The Internet Encyclopedia of Philosophy provides online, peer reviewed articles about key topics and philosophers.
The Stanford Encyclopedia of Philosophy is kept up to date by experts in the field, and contains overviews of both beginner and advanced topics.
The Encyclopedia of Philosophy ebook is a good starting place to browse for topics.
Try a subject search for Philosophy in Jstor to browse through journals, or search within them.