Here is what I would look at doing:
-get a depth profile of your ponds
-electrical availability, help determine type of system you can run
-as stated by Bocomo, Goals (clarity, aesthetically appealing, fishing)
-distances of runs to diffusers from will determine what type of system or (s) that you may need to use (just from looking at it probably 2 systems and I would want compressors near the middle of the ponds)
-do you mean to DIY or turn key system

Bill Cody and rest of the guys will add to this list and give you more suggestions. This is a main start


laugh
Good land management is an extended learning experience-Aldo Leopold