Has it ever had an oil change? Is it dirty? Has it been sitting in a moist spot?
I'd doubt the air filter needs replaced unless your in a very dusty area. Look at it. if it's not too dirty save your money.
I wouldn't change the plugs with only 4k on them.
The brake fluid is a yes. Brake fluid absorbs water so it's a good idea to flush it and replace it.
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