l_v
Timeline rendering will not improve the quality of the export. Timeline rendering is for previewing in the Edit area monitor. It becomes your opportunity to catch a problem sooner than later. So, you do not have to do it.
If you have not already, you may want to hit Render to see what you have. It is particularly useful when titles, effects, and transitions are involved.
But, right now, you sound like in are doing OK.
Please update us on your progress when your schedule permits.
Thanks.
ATR