The steps to migrate to a RAC cluster are many, involving everything from the business case to migrate at all, to verifying your application is compatible with clustering, to hardware purchases, to educating support staff, to testing. That's not to say it is overly complex, but it is a major decision and a lot of thought should go into it.
Once you have made the decision to cluster your database, this documentation from Oracle provides a step-by-step process in much more depth than I can provide here.
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