Most of our appliances are running at 220v ac, I want to make a specific outlet that would run at 110v ac, so I can use my other appliances which are running at 110v ac only...

If you have a 240 volt receptacle, it is usually a pair of wires to the panel. Reidentify 1 as the neutral, the other as a hot, and coinnect to a single pole breaker sized no greater than the breaker.
12 for 20 amps and #14 for 15 amps.