An illuminated dash light can have multiple meanings.

Here are some things to check.

First - if the Oil light is on, stop the vehicle (safely) and immediately turn off the engine.
When it is safe to do so check the oil level, if it is not touching the dipstick check for leaks or missing oil pan plugs.

If the light is a check engine light:

1. Take note if the light is solid, blinking or goes on and off over a short period of time.
2. Check the Internet or users manual to determine if the light has a common cause.
    For example, a loose gas cap can trigger O2 sensor problems in some models.
3. Consider purchasing an inexpensive OBD2 reader if you are mechanically inclined.
    This can provide some insight, and even if the problem requires a mechanic you will have more data.
4. After checking the obvious things you feel comfortable fixing you may need to contact a mechanic.
    Consider asking your friends and family if they have any recommendations or references.

Other tips, keep a log of your findings, it may help the mechanic in not checking things you 
have already ruled out, it also shows them you are somewhat knowledgable.

If the mechanic's diagnosis doesn't sit well with you, always consider a second opinion.

Best of luck with your car, let me know if I can be of further assistance.
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