One thing I would suggest is to go to the Palace of the Dead and do it solo. RDM is very well equipped to deal with everything PotD can throw at you so it's not nearly as annoying as it can be with other classes. RDM also does fairly well with PotD in that your growth from level 1 through level 50ish is pretty well presented. You'll actually get to experience the class growth from start (or, actually, before it's hard coded start point) to level 50+ by just playing through to level 40 or so in PotD by yourself without worrying about holding a group back or letting anyone else down, and you can learn how it all feels hands on rather than just in a text description or in a video. It only takes a couple hours at most. RDM, to me at least, is a very tactile class that has a great flow to it that you can only really get into by playing it.

The only thing you won't really get much experience with in PotD is AoE play but that aspect of RDM is simple and obvious, especially once you understand how the single target works.

Kudos for wanting to be a RDM and for caring about actually learning the job! Don't let the Skip Pot haters let you down!