Try searching "new buyer" or "buying guide."
There's been a lot of threads on here with similar themes.

The search feature is great- not only has it saved me a lot of time, but money as well.

A quick comment might be:
You either like working on cars, or you will spend a lot of money, or you will be one of the lucky few who finds a car that doesn't need much at a reasonable price.
The newest w123 is 23 years old. Not a new car by any stretch.
But they're also some of the best engineered, and easy to work on, vehicles on the market.

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