Marcia,
That depends on a lot of factors, such as the following (not limited to just these things):
• How much do you love or hate your current regular job?
• How much do you want to do other more important things than your current regular job, like spending time with your kids (if any) or so?
• Without your regular job, how long can your current fiscal resources cover your day to day expenses?
• When you quit your job, can your current fiscal and non-fiscal resources also allow you to start a business or an IM venture?
• And a lot of other things ...
Generally, many (not all) people start out with a day job and use their free time to work on their business or IM venture ...
Here are just some reasons why they do this:
• They get consistent income from their regular jobs that covers their consistent day to day expenses ...
• They have significant free time each day to work on other things that can potentially earn them more consistent income ...
• Their income from their regular day jobs is a significant source of fiscal capital for their businesses or Internet marketing ventures ...
• Their regular jobs provide them access to things that they can use for their businesses and Internet marketing ventures, such as professional networks and so on ...
• Their regular jobs allow them to learn and practice new skill sets that can be useful for their businesses and Internet marketing ventures ...
• And many other reasons ...
That's it for now. Cheers!