A pond that shape and depth can easily be aerated with a 1/4 to 1/3hp compressor either rotary vane or rocking piston (wobble piston). One diffuser with 2 or 3 heads should do a good job of circulating this Ohio pond with 4-6 hrs of mixing per day. For winter mixing you may need to run the compressor 24/7 during the coldest part of winter to keep a constant ice free area.
Don't depend on the aeration to do much to minimize algae and weeds. Ducks should eat or suppress most of the algae.
Is there a complete list of all items that I need to purchase? As of right now the only things that I am sure of are a compressor and diffusers.
Which type of compressor has either the longer life span or ease of repair/maintenance?