Where to find your guild -
https://wiki.project1999.com/Kelethin_Starting_Guide
What to kill, won't be easy, but doable as we all have done this. Right click on enemy and try to kill something that says "looks like an even fight". Once you get to level 2, then kill things that cons blue or says "looks like you would have the upper hand". For example, Decaying Skeletons for example would be good at level 1. A command worth knowing especially that you are new to the game is /loc, especially useful if you know you are going to die, then you know the location where you died. Make a macro of it which all macros and custom macros are the 4th tab. Right click a macro, give it a name like loc, color the font so you can easily find it, type /loc in first of the 5 boxes, hit accept/ok. So if you can work with coordinates, you will never lose your corpse, just keep clicking the loc macro and work your way back to where you died.
Anyhow, hope this helps and use that wiki (
https://wiki.project1999.com/), just about everything you need to know is posted there.