My :2cents:, get a bigger tractor. Shredding 35 acres with a 4ft shredder will take F O R E V E R. You need about 6ft, and that's on the short side. I would say a 4WD 40HP tractor with FEL, grapple, and rear blade is your minimum. 50HP would be better. This does not have to necessarily be new. Another idea, get 2 tractors. A smaller one with FEL, front hydraulics, grapple and a nice 3PT hitch. Then an older, maybe even 2WD (your land looks very flat) high HP tractor to run the cutter. This ways the loader tractor could be much smaller (30HP minimum), and cheaper, and more easily able to handle the grapple. A big 2WD tractor won't cost too much, and you could wait a few years on that if money is tight
Besides the shredder and loader, the big implement you will want are a grapple and some sort of rear blade. The grapple will move brush and rocks, which seems to be your big task, and stack them. Pricey, but very useful from what I hear. A straight rear blade is fine, or a box blade. Both are better with hydraulic movement powered by rear remotes.
What I would not do is get a 30 or 35HP tractor with loader and all implements, and try to use that for everything. Things will take much longer, especially the mowing, and you'll want to upgrade in a few years, which will cost you more in the end. A decent used 35HP 4WD tractor with loader, blade, and grapple; and an big older 2WD tractor with shredder should only run you about 20K, especially if you look used for implement, and you will be set for quite a while.
Look all around for good used deals.