I'm a new grad on tele, too, and I looooooooooooooooove it! Yes, you will feel a little lost at first, looking at all those squiggles on the monitor. You WILL get it--and your hospital should be providing you a dysrhythmia class. Ours was 16 hours with an exam at the end, because we have to be "certified" to work tele--basically, you need to be able to recognize two rhythms IMMEDIATELEY--vfib and vtach. Almost everything else you've got a minute or two to run it by another RN if you're not sure. Of course, if your rhythm is a sinus brady in the 30s and it's dropping--well, maybe you don't have two minutes for that....
The other thing you MUST remember is that, even if your monitor is alarming vtach for the 50th time that shift, and every other time it's been nothing...you MUST go check your patient! The other advice I would give you is, lung sounds and heart sounds are pretty important in these patients, so it never hurts to get a second set of ears to listen if you're feeling unsure. When I was in orientation we had a patient admitted with COPD and you could hear her wheezing while standing next to her....but you couldn't hear the wheezes on auscultation--her lung sounds were just very diminished. So I made my preceptor listen, because I thought I was just a moron--and she said the same thing! A few instances like this have made me feel a little more confident in my assessment skills.
Anyway, I know how overwhelmed you feel! I just started in July. I work day shift, and our usual patient load is 4-5. You will do great! Just be patient with yourself.