I could probably show you better than I can explain it. Maybe the next time you are in town, you can stop by and I can show you my tank and we can draw some stuff out with a pencil.
Keep in mind, you are kind of jumping into the deep end of this hobby with all this new terminology, processes and plans. It will take reading, reading and more reading to understand what it all means. A very small handful of people get it, right from he start.
Before you build anything, make sure you are aware of what is needed. Otherwise, you will, in this case, end up with a wet floor and damaged merchandise.
Reminder: AGA, Oceanic and most other tank manufacturers will void the warranty on their tank if you DO NOT use their stand. Personally, I'd rather take my chances with my own, over-built, stand.