OR rent a bobcat with an out front flail mower.
You will knock over the whole 7 acres in a day and the clippings will be fine enough to be a useful mulch.
Get a 12 V sprayer , a lot of Round Up , a ute load of blood & bone and if there is a poultry farm , stable or dairy near by a couple of loads of manure, see if the local arbourist needs some where to dump ground up tree branches as well .
Spread the blood & bone , mow down all of the vegetation then toss the manure on top.
Anything that grows through hit with the round up.
DO this far a full year at least so you have a good idea about the sun, rain & wind before you start to landscape.
Last thing you want is to spend a fortune on laying a lawn only to see it turn into a bog in winter .
Establish a smallish house lawn near the house with a few different grasss to see what suits your local climate .
Once you have a feel for the property and established the house lawn then start to work on the remaining 6 acres.
Trees need to go in first so they can establish without competition from the agressive greedy grasses.
My workshop is on the urban fringe of Sydney, so I have lots of city working tree changers who move onto lots from 1 to 20 acres and plant out their "ideal dream" landscape which in a very short time becomes their worst nightmare and a never ending burden.
So many have sold out , exhausted, bankrupted & dissalusioned in less than 5 years .
