RE: new bow hunter in training!
I'd use caution or at least check into it with local authorities although I doubt that outcome would be a good one. You'd be better off with an abondoned building or warehouse where you could do it indoors. Pehaps if you checked around you could find a nice side area where you could set up a 20 yard range that might even be good when the weather is sour.
I wish you luck and also, welcome to the forum and the passion we all call bowhunting/archery.