You could readily share some materials that didn’t make it into your lessons, information from your lessons, good thoughts from books and articles you’re reading, etc.
You can get started with free tools like Blogger.com and Wordpress.com.
God is raising up a new generation of Bible teachers to change lives. You may be one of them -- this blog is full of tips and ideas and commentary to encourage you in your teaching ministry. Glenn Brooke is the author of Teach the Bible to Change Lives (http://www.teachtochangelives.com) and has over 20 years of experience teaching the Bible.