It sounds like there's a lot you've neglected. You don't mention what was done before the last 30k miles, so . . . Off the top of my head: air filter, fuel filter, coolant, transmission fluid, spark plugs/wires, distributor cap/rotor, wiper blades, brake fluid, serpentine belt . . .
Not all of these will need to be done, but without more info, I can't tell you what is in a state of neglect. And when you say the plugs have never been changed, I'm guessing you mean recently. Plugs wear out, and if it still runs at 230k with the factory plugs, that'd be a minor miracle.
Basically, I would recommend going to ebay/half/amazon and getting the Haynes manual for your car (used of course). Routine maintainence is right in the front. Good luck! You can do it!