Here’s some ideas from John Piper:
1. Know this: God uses clay pots. This means that if you feel average or below average in your fitness to share the gospel treasure, you are closer to the truth than someone who feels powerful and wise and self-sufficient.
2. Get resources to share. Think: Wherever I can I want to commend Christ. I want to tell the story that God uses to give people life. Put them in your pocket, your purse, your briefcase, your car (John Sather said he carries a box of resources in his car). And pray every day, Lord, make me a saving blessing today to someone.
3. Know that God uses many influences. Keep in mind that what you say to someone about Jesus may be supplemented by a half dozen others that God is providentially lining up to speak to this person as God pursues him for salvation. You may feel your word was wasted. It is never wasted (1 Corinthians 15:58).
4. Be a lavish giver. Be known as a generous person, not a stingy person. Jesus said, “Lend, expecting nothing in return” (Luke 6:35). Combine this reputation with giving books, if you know someone is a reader. Give a Christian book that cost you seven or ten or fifteen dollars. Tell them what it meant to you….Be lavish in giving away Bibles and portions of the Bible.
5. Find people interesting. Evangelism gets a bad reputation when we are not really interested in people and don’t seem to care about them. People really are interesting. The person you are talking to is an amazing creation of God with a thousand interesting experiences.
6. Be encouraged you are not alone. “We will train new evangelists and then team them up with experienced evangelists. This is an excellent opportunity to learn how to better articulate and share the Gospel of Christ.. . . Our deepest desire and prayer is that the gospel of Jesus Christ would be spread through the lives of the saints..”
7. Invite people to church. Or, nowadays with the internet, if they are hesitant to come to church, invite them to http://www.desiringGod.org or wwwhopeinGod.org.
8. Fill the city with gospel teaching. If all the Christians were talking about Christ, and giving out literature about Christ, and sending emails about Christ, and inviting people to church for Christ, and being lavishly generous to others for Christ, then someone might say, “Those Christians have filled the Twin Cities with their teaching.”
9. Use your giftings. We are all in this together, but some are gifted one way and some another. Find where you fit and stoke the flames of your effectiveness there. Grow in every area, but don’t paralyze yourself because you are not like someone else. God made you and means to use you in evangelism.
10. Read books on evangelism. Here are three books that you can get…to carry this message on for the rest of your life: Will Metzger, Tell the Truth; Mark Dever, The Gospel and Personal Evangelism; J. I. Packer, Evangelism and the Sovereignty of God.