Good luck with your new venture - sounds very exciting and you are obviously brimming with enthusiasm!
We keep goats, chickens, sheep and have a plum orchard (and a few pear/apple/cherry trees scattered about) we are on around 4 acres and despite trying, even being self sufficient in veg proved to be a struggle. Research what will grow well where you live and perhaps grow lots of those things and find someone to barter with? we swapped eggs for tomatoes, goats milk soap for oats and flour etc etc and it works well.
Livestock wise, you will need to keep them in the appropriate numbers and do your research well. Goats were the steepest learning curve I've ever encountered in my life, they don't much like grass and will expect shelter, browse material and whilst they will keep your grass down a bit they will also need a good worming programme, vaccinations and hoof care.
Sheep need to be in a flock or you will have a sad, lonely cade lamb. They aren' twithout their issues either...many a night I've been out at 2am attempting to kick start a bloated lambs rumen, syringing ginger goo into them and generally wishing I could go to bed! nature of the beast with orphans
Having said all of that we've enjoyed our switch from the rat race in london to countryside bliss (both from countryside originally but found ourselves nursing in london...) Hubby still works full time and I now run the soap business (also full time, quite by accident was meant to be a hobby) perfect way to bring children up too!
enjoy the forum
lisa