What is “grad school?” Like most answers to questions asked during graduate school, “it depends.”
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You can go to graduate school for anything, as long as you’ve completed the prerequisites.
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You get to pick the focus area you become an expert in.
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It is possible to go to graduate school for free.
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It is possible to get paid to attend graduate school.

So what questions should I ask myself? Visit this page for more on that topic.
All About Graduate School and Professional School Applications
The video below is a screen and voice recording about applications to graduate and professional schools. The referenced slides (including alt image text) can be found here.