The type of system you currently have, your budget, and your ability to measure, test, and learn basic audio principles will determine what is best for you.
If you are a complete novice and are not prepared to make lots of mistakes and invest a lot of time learning about this stuff, you should look for an amp or AVR with built in room correction. These systems are often very easy to use and the better ones sound pretty darned good.
These may be out of your price range, but are among the best sounding easiest to use amps with built in room correction. The TDAI-2170 is about $4,000.
https://lyngdorf.steinwaylyngdorf.com/electronics/
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