Does every believer have a calling even if they are not a preacher or missionary?

Yes. Every believer has a calling, and it is not limited to being a preacher, pastor, teacher, evangelist, or missionary. God has a plan and something for each person to do, and it is up to each believer to seek and discover that purpose.

Les teaches that the Corinthians were carnal and had many problems, yet Paul still calls them brethren and says they had a calling. Every believer has a calling, but that does not mean you must be a preacher, pastor, teacher, evangelist, or missionary. There is something God wants you to do; He has a plan for your life, and each person should seek it out and find it. Les also notes that God does not use the ones we think He should use, because not many wise men after the flesh are called.

1 Corinthians 1:26

For ye see your calling, brethren, how that not many wise men after the flesh, not many mighty, not many noble, are called:

Does every believer have a calling, and does it have to be full-time ministry?

Every believer indeed has a calling from God. That calling does not require full-time ministry roles such as preacher, pastor, teacher, evangelist, or missionary. God has a plan for each life, and each person should seek it out and know God has something for them.