I went whole hog and brought out what i thought was a expert at first................then i found pond boss.I wish now it was the other way around.
Now I'm going to guess you aren't in a hurry? From my experience I would say do all the research you can on here,locally and then some.Try and make a plan of action that fits your budget,time frame and then hire a expert consultant or two and see where you stand.

Sounds like you have a nice chunk of ground there and while it may be cheaper to do everything at once for some of us it just isnt feasible.From the initial description you might be able to work in stages.

Anyway best of luck and research is your friend.