your going to introduce a pest on purpose?????
i wish i had your land and the permission to turn it into a shooting resort!
you may have issues with new bunnies just running off and going to other warrens on neighbouring land as there won't be many on there for a reason if it hasn't been shot before.
if you have the space, time, money to do it make yourself a rabbit pen. dig in about a meter or two and lay paving slabs or even a thin spread of concrete in an area as big as you can 25x10 metres would be a good size to start with (i didn't say it'd be cheap!). then double or treble thickness chicken wire round the sides of the hole and fence up to about 3 1/2 feet high above ground. fill the hole back in and mound it up in the middle and introduce captured bunnies into it. you can use it as a breeding pen if there are no issues on the land with you being ridden with them. when your population gets up capture some and release them or make a gate in the fence to let some out then close it again.
its gonna be a lot of work but (if its legal to do it??) you would have a constant supply of bunnies going onto your land and no predators to remove them before you! if you think long term you could have a very good shoot that could make you a couple of bob!