What should I do next?

If you are confirmed by a local church and leadership and they have officially commissioned to “send you out”, as in Acts 13:1-4, then you can start, depending on where you are at in the issues of deciding on where to go; what people or country, and what mission agency to join.

These are the issues you have to work through.

What people or country or religion ?

What is my role/gifts/desires?

What mission agency to join?

What team to join with?  (maybe you will join with other like minded believers who are with another mission agency on the field, and your church and mission agency will have to work out how you will partner with each other. 

Maybe you have the vision and gifts to actually start a church planting team and lead one to another culture! –  talk to your pastor/elders and church leaders and explore the possibilities.