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I want to upgrade the processor and graphics card + add 4gb of ram (In order to play better games with better settings) how do i do this? and what can i upgrade to (Or should i just buy a new one)

Follow this tear down on iFixit. iMac Intel 21.5" EMC 2428 Teardown Suggested upgrades are: • Upgrade the graphics card if needed • Upgrade the RAM • Upgrade to either an SSD or a Seagate SSHD hard drive. There are a lot of previous posts in this forum asking the same question with great suggestions and web links on the exact parts to purchase.