Unfortunately this more difficult than it used to be and there are many reasons for that. It is vital that you work closely with your pastor. He may, or may not, help you get places to preach and you should not be offended if he does not.
The first and most important thing you can do is apply yourself to prayer, study of the word, soul-winning and supporting your local church.
Normally, it may take time, but eventually doors will begin to open for you.