On the reo website I see a LP reomizer but not a LP RM2? Is the LP RM what I need?
You are looking for the LP RM2 if you select a LP Reo. There are 24 atomizers on the site when I looked yesterday - try selecting the option to view 25 items per page to clear up any display problem. It is there, but the 20 items/page view was acting a little wonky for me. Can't go wrong with a single coil RM2 to start your Reo journey.
Of course you need your Reo. The low profile (LP) versions will allow you to attach almost any other bottom feeding atty you may want to try in the future. A standard profile Reo has a deeper catch cup. That's good if you use non rebuildable attys or cartos with a Reo, but it limits you to RBA's re-milled to fit down into that deeper catch cup.
Extra bottles? Your Reo will come with two - one in place and an extra one with a cap. They are cheap enough, but unless you are the type who changes flavors a half dozen times a day you don't need to go nuts here either.
Spare tubing and cap thingy? That isn't a part you can really break on a Reo, but if you run some really nassty smelling stuff through your Reo replacing the tubing/cap - and your bottle - may be the only way to completely get a real stinker odor out of there. Again - a very cheap piece of kit ot have on hand.
Definitely get an extra battery spring. That's your safety - if you dead short a Reo the spring collapses. Major sadz if you have an accidental short and not having a spare spring is the only thing keeping you from using your Reo.
IMO you don't need a rebuild kit. That's a major production replacing switch parts, you need to be savvy enough to take that on if it's ever needed, and you really have to do something very bad to ever need to replace those parts. Plan B is to just send it back to Rob and have him do that kind of work if it's ever needed.
Other than that... The usual stuff: Got suitable batteries and rebuilding wire and wick of your choice?