Follow this link for your check engine light.
http://www.2carpros.com/dia/how_to_scan_trouble_codes.htm
Ooops, the link is for 96 model and above. But the idea is the same only the trouble code reader might be different.
If there is a Autozone (Auto Parts Supply) close to you, they can check it for you free. Just tell them you have a 94 Camry so they know what kind of code reader to use. Then, post another topic here with the Diagnostic Trouble Code (DTC) so that the mechanics here can help you.