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This really depends on how the weather is acting. There is no set schedule, unless you know how often lawns need to normally be watered in your area. On hot dry days, you may have to water twice per day, where as cooler days may only need water every 2 or 3 days or so.

It will be very clear when it is established, in which case you will only water once a day during hot or dry times, and once or twice per week when it is mild. You won't water at all when there is rain.

This article will offer some information: https://www.gardeningknowhow.com/lawn-care/lgen/installing-sod-instructions.htm

It can be a good application for this, actually. Having a low nutrient content, and often many beneficial fungus present, this can work just fine.

If no application rates are on the packaging; Apply at 135gms per square metre, either by hand or with a spreader.
Leave the Lawn Sand to work for a day without watering. If it does not rain within the next couple of days water in thoroughly to make sure the Lawn Sand is taken down into the grass. Avoid walking on the lawn until it has rained or been watered in. Wait 3 days after application before mowing the lawn.
Leave the Lawn Sand to work for a day without watering. If it does not rain within the next couple of days water in thoroughly to make sure the Lawn Sand is taken down into the grass. Avoid walking on the lawn until it has rained or been watered in. Wait 3 days after application before mowing the lawn.

Dormant seeding is the common term for over seeding lawns in late fall to early spring while soil temperatures are too cold for grass seed to germinate. In the mid-west that's usually mid-November thru March when soil temperatures are below 50 degrees. Harsh winter weather will not harm dormant grass seeds.
If you missed the fall over seeding window, dormant seeding helps to eliminate bare spots and thickens turf to fight spring weeds.
I would recommend talking with your County Extension Office for a seed recommendation for your region and growing zone.

This link will help you locate the office nearest you.

https://www.gardeningknowhow.com/extension-search

You can also talk with a local garden center or nursery to check what grass seed they have available for dormant seeding.

This is a germination blanket, or also sometimes called a lawn net.

When to seed is mostly determined by the type of grass that you intend to plant. Cool season grasses are planted in Autumn, and warm season grasses are planted in Spring.

This article will give you more information: https://www.gardeningknowhow.com/lawn-care/lgen/overseeding-information.htm

Spring is a great time to seed grass, make lawn repairs and treat weeds.
I'm listing several articles to help you get started.
https://www.gardeningknowhow.com/lawn-care/lgen/spring-lawn-maintenance.htm
https://www.gardeningknowhow.com/lawn-care/lgen/type-of-lawn-fertilizers.htm
https://www.gardeningknowhow.com/lawn-care/lgen/lawn-fertilizer-tips.htm