First of all, you must be called by God to be a pastor. Most pastors attend a theological seminary or bible college, yes.
If....someone should decide to be a pastor on his own, without God's calling....he'll never make it...the enemy will eat him up for lunch.
God bless our pastors. I've got a great one at my church, I praise God for him. He got his bachelor's degree at Union University and then got his Masters degree at Trinity Theological seminary.
And he loves the Word of God, and preaches like it!
Love,
Dreamer