In terms of maintenance, boundaries are the priority. It might need completely re-fencing. Trees are not an issue if you have all the gear, but if you have to get rid of one, you need chainsaw, probably hire a splitter, and then some way of getting the wood out e.g. trailer.
It really depends on what you want to use the land for. Any animals in there, or letting it out for grazing, your fences need to be tip top. A rather lazy farming neighbour of ours has had cattle escape twice. One lot ended up on the A38. Another lot got into the neighbouring turf field and had to reimburse for the turf damaged by the cattle. They will climb a 5 foot hedge no problem if there's not good fencing to stop them.
Also if letting out you'd need a water supply and a trough.