Help with a french drain

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Both drains will be 50'-80'

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That's a lot of drain

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can anyone point me to a good starting point?

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Hire someone that knows what they are doing. If you try to do that yourself and you don't get it right, you end up with a bigger mess than you have now.

Where do you live? I could give you a name or two.

I'm a do-it-yourselfer type, but I installed a french drain a few years back and I'll never do it again. That length is going to be hell to grade correctly. Pay someone with the skills and tools to knock it out in a day or two, instead of spending three weeks covered in mud staring at a level.

Your going to need a minimum of .02% slope for it to drain correctly, start at the pipe you want it to empty into and work the grade back a to make sure you aren't going to daylight the pipe

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French drain" isn't very efficient, depending on your soil make up

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Absolutely, used to have a drainage and irrigation business and I rarely installed french drains as without sandy soil they will do you no good.

An option is to dig your drain but backfill with sand only which will allow the water to seep into the drain and run out.

9 times out of 10 wet spots can be alleviated with proper grading by bringing in some dirt to push standing water to where it will drain or tilling and regrading entire yard to slope correctly. If neither above is not an option properly placed catch basins will work much better than french drains in the clay soil we have around BR.