Your sight seems very similar to mine, very flat. Unfortunately, you will find out that installing a pond when its flat tends to be expensive since you will be moving a lot more dirt to create the pond (I think my dam is all of 18" high, the rest is being excavated down to 12' deep). The only benefit is that you can really make any shape you want. In my case I'll be using the pond for mostly bass fishing, so I made it long and skinny to maximize the amount of shoreline. I was advised to put in some peninsulas to keep the wave action down so the banks wouldn't be eroded away as quickly, so there's 3 of those. For the width I went out and measured how long my average cast was with the lures I like to fish the most and made the lake so that I could take a little bass buggy up one side and down the other. Also added a 3/4 acre spot that's very shallow for duck hunting. In all the lake/pond should be 2 acres in size, plus the 3/4 acre shallow area.