The following areas are ballpark numbers & you will have to search somewhere between these areas. Some vocals may have these same issues, but at even lower or higher frequencies; each vocal is different. You won’t always need to cut every area either. Some vocals may need a cut in a certain area while some are best left alone in another area.
The more & more you get involved in mixing, having some good EQs in your collection will be useful & can help your workflow. Now, the most important thing though is knowing how to properly use any EQ you have & know what to search for when boosting or cutting frequencies.