Whilst some may sympathise with your wish to help song birds and hedgehogs, perhaps you should have done some research before considering purchasing that particular piece of land.
Badgers are protected by the law in England and Wales and so are the setts (burrows) they live in, under the Protection of Badgers Act 1992. Likewise corvids are protected – it is illegal to hurt any wild birds including corvids. So what you are suggesting is both illegal and inappropriate.
If there are no hedgehogs already in the area there may also be other reasons for that, in that it may not be a suitable area for them.
Hedges are good for hedgehogs, as are wild flower meadows. Rose gardens not so much and raised beds would need to have methods of access provided for hedgehogs to get to them so that they can forage for food.
However, I suggest you do some studying before considering purchasing any land to help hedgehogs, then you might find somewhere that is more suitable for them, preferably where there are some already present and you don’t have any potential problems with other species. Then you can ensure that the habitat continues to remain suitable for them in the future.
