"Planting Missional Churches" by Ed Stetzer is a book I found very helpful on the topic of church planting (good for dialogue and thinking). I know a pastor who tried a couple different jobs to find one that best met his needs while freeing him to pastor the church. He found it helpful to have a job in which he worked more hours on specific days that left other days completely open.
I think it is important to seek God as to what He desires and provides. Much will depends on where you plant and what partnerships God provides. God could connect a planter with a group that have a heart for planting a church and much support is provided. Churches have also started as missional Bible studies with the planter working full time or nearly full time.