While you might want to leave this to a professional exterminator, spider nests have some common locations.
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Check around window wells. These retaining walls are outside your house around basement windows that are placed close to the ground. A spider can make a nest within the wells, allowing the spiderlings to enter your home.
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Look inside your crawl space. This dark, generally uninhabitable area for humans could contain a spider nest. Bring a flashlight with you to check for the nest.
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Inspect the corners of your garage and storage rooms. These corners, again dark and generally uninhabited, might be where the spider decided to nest and have its spiderlings.
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Crawl underneath your porch or other outdoor areas, such as a deck. If you failed to find the nest in or around your house, then the spiderlings might be hatching outside and making their way indoors. In this area, you will likely need a flashlight as well.