Welcome
Sounds like a good plan.
First ask your county forester.
Now, some questions to consider:
Is this supposed to be a "for profit" exercise?
When you write "save for milling" what time period is implied by "save" and what comes after milling?
What is this milling you write about? (a 60cc saw and a Mark III or a Woodmizer LT70?)
Are these 6" DBH trees which will become 20" DBH in 20 years or 20" that you will mill next year?
Are you planning on selling the milled lumber for profit or self use?
Soft maple is used for railroad crossties, boxes, pallets, crates, furniture, veneer, wooden ware, and novelties.
http://www.mapleinfo.org/htm/maplumprop.cfm
I've got similar plans over a bit more land. I got to this forum because I wanted to
a) clear for food plots, fire lanes, and trails
b) make sheds, deer blinds, etc. on-site.
Thus to me, instead of cutting the trees for a) and hauling the logs out and then hauling store bought lumber in for b) it will be simpler to mill on site.
At this time it seems it's easier to sell firewood than lumber. It may take several years for the furniture market and lumber market to rebound.
However after my first CSM attempt
I've dried and further processed the wood and have built a crude workbench. And plan on building some simple chairs and benches.
So without further info and no near term projected use of milled lumber I'd say it's not worth saving the soft maple for milling.
good luck