There's not enough information here to give you a step-by-step action plan to handle database growth. I don't see the indications for how fast the database is growing. There's no indications that you have monitoring in place for tracking the size of the database. I'd suggest starting there.
Also, this sounds a little like homework. If so, you need to do it yourself.
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Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning