If you decide to burn the brush pile, it will burn a lot better if allowed to dry and compress about a year. Burning fresh brush piles is a lot harder and often requires added fuel to get it done compared to a 'seasoned' brush pile.
I know waiting until it's dry and settled will burn much better. I have already burned six piles in the past two years. (This place was an overgrown mess, from many years of neglect.) None were burned green. The last one dried three months, but had a lot of big trunks and dirty stuff from clearing the pond area. I had to cut up the big trunks and re stack and re burn later, but it finally burned up. The current pile doesn't have anything in it over six inches, and most of it is briars, twigs, vines, cedar branches and dead wood. I think it will probably burn up ok after a couple of months. I need to get rid of it before spring. When burning, I keep pushing stuff in with a pole as it burns down and it eventually becomes a pile of ashes.