LE does stand for Limited Edition. But LE is not a "trial" version (VDJ Pro has a time-limited trial version). It will work for as long as you'd like it to (won't expire in 30 days or something like that), and it doesn't do anything odd like: only let you play 45 seconds of a song, or play some "announcement" that "this is a trial version" over your audio. Here are the limits of VDJ LE:
1) LE will do audio files, but not video or karaoke (cd+g) files. If this isn't part of what you intend to do, you won't miss it.
2) LE is "locked" to the RMX, so if you try to use the software without the controller, or a different controller, you won't be able to.
3) You cannot access the configuration menu. The RMX comes configured just fine for VDJ LE (disc is in the box), but many cool features and all skin changes are acessed by the config menu, which you won't have. The LE is designed to be simple, plug and play, which I think might be ideal for someone "just getting into it".
The analogy I make for people is: if you buy a Pioneer DVD burner, it comes bundled with Nero brand software to burn DVDs and CDs with. These are two separate companies. Once you've installed your Pioneer burner, you can use the Nero software that comes with it to burn DVDs, no problem. And it will last for the life of that drive. But... Nero will hit you up to see if you'd like to "upgrade" to the "deluxe" version of their software.
In the same fashion, Virtual D.J. would love to see you upgrade from the LE version that comes with the RMX. VDJ Pro sells, every day from their website for $300. If you register your LE version, and upgrade from it, it's $150, saving you a full 50%. I would think that you can start with the LE version, and possibly upgrade later, as you get more confident and experienced with your usage.
Anything else I might help answer?