RE: Building First Duck Blind...
Floating blinds are great because they go with the flow as far as water level is concerned and they can be floated around until you hunt this place for a while and figure out where you want to locate the blind permanently. Be sure to anchor the blind well if there is a risk of current.
This is actually a perfect time of the year to start your blind because you'll have time to establish native plant growth into your blind. It will have all spring and summer to blend in perfectly.
You might want to think about doing something to enhance the waterfowl habit in your new found place.
As far as the poles in the mud; you'll be fine if you decide to go that route. We use to have stilt blinds on our bay for years, but the hippys saw to it that they be removed. Those dang environmentalists gotta take everything. Anyway when you build your blind you'll establish shear in every direction which will make your blind plenty sturdy.
I'm pretty jealous. It must be nice to have your own hunting club.
Boldt