There are many software programs out there and for one just getting started it can be a bit confusing.
A search with google.com will provide many sites offering free or trial software. Be aware that downloading and installing software on your computer that has come from untrusted or questionable sites can lead to virus or spyware problems.
Here are links to popular free e-mail, browser, and utility programs.
WordPress Blogs (WordPress.com)
WordPress Self-Hosted Non-Profit Version (WordPress.org)
Archived Old Programs for Older Computer Systems: