Fall is the best time to redo your lawn but now is the best time to start with the basics. Is the area that you want to plant grass have 6-8 hours of full sun? If you have shade trees, think about adding mulch under the shade and plant shade tolerant perennials and small trees like dogwood.

First, you need to take soil samples and send them to the soil testing labs. Here is a link to taking soil samples and the soil testing labs that are approved by the State of Maryland. I see that you have a lot of clover which can help a lawn if it doesn’t choke it out. You will need to take 10-15 soil samples, dig down at lest 3-5 inches deep, take the top ¼ inch off and place each sample in a clean plastic bucket. Mix all samples together and take 1 cup to mail off to the soil testing lab. They will let you know how much Agriculture lime you should add this spring, and they will also let you know how much and what amounts of nutrients from Nitrogen, Phosphorous, Potassium, plus all the minor nutrients that you should wait until fall to apply.

https://extension.umd.edu/resource/soil-testing-and-soil-testing-labs/

The reason you add lime in the spring is that it will take time for the lime to sink into the root system to bring the soil acidity or soil pH up to a healthy number so that the lawn can thrive. Grass needs the soil pH to be between 5.8 to 6.5. also, I see that you have moss, so that leads me to believe that your soil is very acidic.

https://extension.umd.edu/resource/starting-new-lawn/

In the fall you should purchase a turf type tall fescue grass seed, it is the best for most counties, and it should thrive in Frederick county. I have attached another link for starting a new lawn. Over the summer you can decide what plants you want to keep and which you need to remove. Wait until fall – September should work in your area. Fall is the best time to remove (chemically) the weeds as they are getting ready to go dormant and with chemicals like Glyphosate, will carry the chemicals into the roots for better control. Once the weeds are controlled, it is time to get the soil ready for seeding. If you do not have an irrigation system, seed areas that you can water, or all your work will be for nothing. Measure your yard and purchase the amount of Turftype Tall Fescue and fertilizer. Work up the yard with a tiller that should also loosen the dead weeds for removal. Rake out the soil so that it is smooth and flat. Add half of the amount of grass seed and spread it with half the amount of fertilizer going in a north -south direction. Then spread the rest of the grass seed and fertilizer in an east-west direction. That will ensure that you have a great stand of grass! You will need to keep the soil evenly moist for up to 2 weeks until the seed germinates. Once the grass starts to grow, water the grass in the morning 3-4 times a week. Once they are well established, drop the watering to 2 times a week.

In the spring if we don’t have rain for more than a week, water the lawn!