To create one you have a box with some options, name, quantity, do u want this or that, nothing more. To be honest first time was scary, I also told to myself, "i do not understand this" but, I gave it a second try. There is a lot of info explaining the theories but to create a SMT, just that, is very simple operation.
As I told u before, it is nor complicated at all and from ur answer I can realize you ar not stupid at all ;) give it a second chanse to the WP and you will see. You can also read the series from @dragonroua about it, very easy to understand :) First chapter here.