If you’re looking for some great resources on evangelism, I highly recommend this post from the Gospel Coalition. There are dozens of articles, books, and other resources on the topic. Below is an excerpt from the post:
How do you spell “evangelism?” For many, if we’re honest, it is spelled “programs”—a guest evangelist in the pulpit, Vacation Bible School, Christmas concerts, and the like. Such ministries are fine as far as they go; but if our goal is equipping the saints to be ambassadors for Christ who clearly articulate the good news, more is needed.