OK, so I'm kinda of an idiot when it comes to IEM's. So you have the things in your ears but what do you need to get the signal into the ear pieces? Thanks and sorry for the stupid question. Just post a link if you all don't want to write some lengthy post
Well... and I'll keep it short because there are a lot of choices/options within each of only 2 categories:
1. Wired - meaning you are feeding your IEM's with a hard-wired source (think headphones) and are "tethered" by that wire, or
2. Wireless - meaning you are free to move around and need a battery-powered body pack to receive the transmitted signal.
1 is generally cheaper than 2, and if you are wired to your amp via instrument cable, definitely the cheaper choice.
If - like me - you are already wireless (I use a G90) then going wireless will give you the most flexibility.
There are dozens of choices and workable "wired" configurations.. too many to begin to list.
For wireless, it's similar but entry-level systems like Shure PSM200/300, Carvin EM900, Galaxy AS1100, CAD, AT M2 and others will give you a transmitter, body-pak receiver and buds (single driver) and are mostly mono only (Carvin is actually stereo) with built-in fixed limiters. Further up the $$$ line you get PSM700/900/1000, Mipro series, Senn G3 and so on.
NOTE: Limiters are IMPORTANT so you don't get your ears blown off accidentally... most wired solutions do NOT have them built in.
There's a TON of info on IEM via google.. with a lot of opinions and choices.
Search this forum for IEM's and read up...
Here's some other threads on the topic.
In-ear monitor choices
In ear monitors
New Strategies for Improved Live Sound - In Ear Monitors
Decide on a budget, and whether you want to go wired or wireless...
BUY THE BEST YOU CAN AFFORD, and SAVE for THEM, or you'll not be happy.