That kid with a banshee

I have a drag banshee frame with 12 inch extension in the front with 10 inch extended swing arm and it has a 2001 Polaris 700 2 stroke snowmobile motor I weigh 150lbs but I wanna know what size sprockets should I be running I got this thing off of Facebook marketplace and it has a massive rear sprocket and I’m only 14 so I have no clue how to even get started in this drag banshee world