Hello! Thank you so much for the great explanation! That said, I am still having issues using this. I have followed all of the instructions but still cannot create a scene with the tile set imported.
I opened RPG Maker MV (the free trial, in case that makes a difference
Clicked Tools > Resource manager > img/tilesets > Import
After I imported the files, I went into Tools > Database > Tileset > modify maximum (entered 7)
Clicked on the 7th row, and named it in the right menu. Then Images > A1 (where I found the imported tileset) > Apply > OK
... Then I cannot find how to actually proceed. How do I use the tileset to create a scene? There aren't any options that sound like they would mean this (at least to a lay person like me). I went under File, Edit (everything is grey), Mode, Draw, Scale, Tools, Game, and tried to consult the Tutorial under help, to no avail. What do I do? :(