The full planet will not be available until the licence change is complete. The rebuild team is working on it and working the right way : “when it is good enough, but no sooner”

http://lists.openstreetmap.org/pipermail/rebuild/2012-April/000217.html

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All information on the (not so) friendly manual : the wiki ;-)

Example for 3D : osm.wiki/OSM-3D

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OSM also work with pen and paper ;-)
You can use some printed map and check outdoor with http://walking-papers.org/

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I didn't found (yet) how to deal with access restriction that change with time.
There's date or time validity for access restriction and for turn restriction :
osm.wiki/Key:access#Access_time_restrictions
osm.wiki/Restriction

But how to deal with reversed highway ?

You can use Show Your Journey : http://syj.renevier.net/?lang=en
Or you can also use a full GPS data editor/analyser desktop application, for example viking : http://viking.sourceforge.net/

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I've seen this, it looks like what you need :
http://ojw.dev.openstreetmap.org/WhatCountry/?lat=51.8478&lon=9.0282&lang=de

When the road is on the border you can tag it with name:left=* and name:right=* (with respect to the way direction)

Ce n'est effectivement pas le meilleur endroit pour poser des questions :-)
Pourtant sur la page d'accueil du wiki tu as tous les liens qu'il faut :
le forum : http://forum.openstreetmap.org
la mailing list : http://lists.openstreetmap.org/listinfo/talk-fr

Personnellement je te conseille la mailing list.

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Just to mention that GPX is not GARMIN format.
GPX is an open standard (based on XML) for interchange of GPS data.
http://en.wikipedia.org/wiki/GPS_eXchange_Format
http://www.topografix.com/gpx.asp