Forgot the link to seed. http://greenrocklandscapesupplies.com/index/grass-seed-and-fertilizer

Here is a link to some Michigan lawn info. The piece on species and cultivar selection includes some seed vendors in Michigan. Do you need to seed? If you have KBG, probably not as that grass spreads to fill in bare spots. Fertilizer in the fall will suffice. If you have tttf or rye and have bare spots or a thin stand, then overseeding is needed. What kind of grass do you have now? It is probably too late to use broadleaf killers before seeding as most require three weeks wait time before you can seed. You could spotspray weeds with glyphosate which kills everything it touches. You can seed soon after using glyphosate. I looked at your link and did not see anything advertised as sun/shade mix. I was not impressed by any of the mixes. It is difficult to overseed KBG into any kind of grass because it is slow to germinate. It is much easier to overseed fescues or ryegrass. First question, though: what kind of grass do you have?

Michigan is KBG land with fine fescue for shade. Perennial ryegrass is not persistent and TTTF is not as cold tolerant. I see you have quite a lot of weeds in there, broadleaf, annuals, and uggh, roughstalk bluegrass. Do you have an irrigation system or plan on watering? KBG is difficult to establish from seed without watering diligently.

I do have irrigation. This lawn has been neglected pretty badly over the last 10-15 years. I moved in two years ago. Irrigation didn't work, so I started watering a little with sprinklers. This year I got the whole system working, so now my goal is to get the lawn back. I fertilized with Milorganite this spring and will be doing a fall fertilize (and was hoping for over seeding) over the holiday weekend.

Nothing else from anyone? Should I just put down my fertilizer as I planned. Over seed my thin areas and work on killing off the weeds next year and start "fixing" then? I have been reading some renovation threads and am wondering if I should just kill off the front yard and start over? How do you know when to start fresh or to just kill weeds and over seed?

You are running out of time for seeding. If you want to do that, do it now. Go ahead and scalp and seed. That usually takes some planning and time. Maybe put off the overseeding until next fall and see where TLC gets you.

In any case, fall is a great time to apply broadleaf killer so you will still have time in October when the new seedlings can handle it. Make sure you fertilize at least a couple of times this fall. If you have never done one, a soil test is helpful to guide you. And make sure you apply crabgrass preventer in the spring. A 2nd application may be needed 6-8 weeks later to get you through the summer.

Use GDDtracker for that:

http://gddtracker.net/?model=7&offset=0

I suspect you can get that lawn looking great without overseeding since you likely have KBG already. Fertilize well. Most stop watering in fall but make sure you do if mother nature doesn't. apply broadleaf herbicide. You may need one specific for clover (triclopyr) if you really want to get rid of that.

Thanks for the comments. I don't think I have KBG, as my thin areas do not seem to be filling in. Can you tell from my posted photos what type of grass I have? So you're saying that fall is a good time to apply a broadleaf herbicide? Man, I'm afraid that will make my lawn look like trash because I'm scared of the amount of weeds it will kill off and leave bare spots. :-) Should I do that now and then fert in a week? I will be using WBG Chickweed, clover and oxalis killer.

The further north you go, the more KBG is king. Pretty sure you have mostly KBG from the pics you've posted that are closer up. Certainly you can pull some examples and take a close up pic for us. KBG is a relatively aggressive spreader but it does best at it when it is healthy and the soil is moist but well drained. I would do fertilizer and then in a week use the weed killer. The fertilizer will increase herbicide uptake. Since your lawn was neglected, I'd do 3 apps of fertilizer before winter arrives.

So now that I pulled some individual pieces, looks like I indeed have a mix of KBG and fescue (I think) of some sort. My knowledge of grass types and lawn care in general is slim. Plus all the dang weeds....

kbg and fine fescue. two of the most cold tolerant grasses. you have sun and shade covered. both kbg and creeping red fescue spread.

Is there a way to tell what type of fescue I have? How many hours per day of sun rays do you need for KGB to survive?

Not that I know of. Most blends up north use creeping red fescue though. Hard to say how much sunlight KBG needs. I think at least 4 hours of direct. Some partial sun in addition to that is helpful. Some varieties of KBG do better than others in shade. Kenblue, a common type KBG, does pretty well in shade compared to "elite" varieties.