Here's a picture, at least I'm going to try to add it of the pen I built this year. I am by no means a carpenter and had a friend that let me use his saws.
Its 10 foot long and 3 foot deep and I split it into 3 separate pens. Everyone on my road thinks I'm raising rabbits. I made the front I think 5.5 foot and the back 4.5 feet just to get a slope for rain run off. My reasoning for the sizes was that the 1/2 inch wire I got was 10 x 3 and the rough cut lumber I bought was 10 foot long. I bought I think 10 4x4 and ripped them down to 2x2. I probably could have ripped some of the 2x2's down to 2x1 but didn't. I found them at a local lumber yard in their rough cut "pen quality" pile. I paid about $35 for the lumber. The roof is the ondura stuff you can get at Lowes or Home Depot. I watched youtube video's and its perfect for someone that doesn't know what their doing. very simple to use.
I have X-mas lights run inside to add light that I bought at Walmart for $5. I also mounted one of those power bars that I got for $10 to the inside so that i have one extention cord that I can hook up heat lights and my white X-mas lights to. Yes, I went a little overboard but it looks pretty cool all lite up at night.
I would highly recommend watching the Slightly Redneck youtube video on building a quail pen as this is were I got my idea. Coturnix Corner also has a very good pen build video but I had already built mine before I found that one.
Good luck and have fun