Question on first Rolex purchase

[Double B]

Now that my brother has got my interest up in quality watches I'm still trying to decide the year of Sub to buy. I have a couple related topics of concern:

1) - How important is it to have the warranty papers?
- How important is it to have the box, hang tag, etc?
- If my intent is to keep it for 10+ yrs is that stuff really important?
- I understand it is for the collector but for the long term wearer?

2) If I buy from one of the trusted sellers here and its used (2006-2010 vintage) it would be out of warranty anyway, and if so, why would I need the expired warranty papers? (I plan to have adjustments & work done by local AD)

This is a great forum with very helpful people! Thanks in advance. -Robb