Hey @Isheeta, follow these steps to launch an RDS DB instance in default VPC:
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Open the RDS console.
 
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Choose Databases in the navigation pane.
 
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Choose Create database.
 
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Choose a database engine. Choose Next.
 
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Choose a use case, if prompted.
 
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Under Specify DB details, review the default settings and adjust as necessary. 
 
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Choose Next.
 
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Under Database options, for Database name, type ebdb. Make a note of the Database portvalue for use later.
 
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Verify the default settings for the remaining options, and choose Create database.