Considering that you are new to RMXP, I recommend just testing the functionalities of Events first before trying to follow any of the 2 above "guides". I didn't watch Thundaga videos, so I can't say how much he does with normal events only (without taking pokémon essentials way of doing things).
Particularly, I suggest that you try to make a calculator (which displays the calculation that you are doing).
But like Echo said, read the wiki and play around the default essentials map. Most common information about this engine are already written in these 2 places.