Are you sure that having a single flat file containing mixed data would be an acceptable solution? Sounds like a real mess to me, but, funnily enough, I had to code something similar last week.
I did it using a single column flat file which was populated in multiple asynchronous script component transformations. I handled the column conversions (.ToString() etc), concatenations and delimiters to produce a single output column from each script component.
Sounds complex? Maybe a little, but I am very thankful that I was asked to write this file rather than read it.
If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.