So I'm a huge fan of the Fire Emblem series playing near every one I could get my hands on. Being finished with most of them I looked for a new one I could play which led me to start olaying Tactics Universe. That game was very much to my liking and I wanted to make a Fire Emblem of my own after playing it. I got an idea and wondered how I could bring it to life (in a way). I found a guide on doing so which led me to downloading Nightmare, FEditor Adv, Mappy, and Gold Finger. I began struggling very early on (surprise) and wanted help. Thus I came here looking for said help

END BACKGROUND INFO (you can skip stuff after this too but please don't)
So I downloaded Mappy, believing creating a map for the first chapter was the way to begin. I got a tileset too but that's where problem number one begins. I wanted to know if it was normal to have gray lines bordering the tiles and if it's bad when each tile is 17x17 (i think it's supposed to be 16x16). I'm sure I'll have more questions as I progress and I greatly appreciate any help any of you gives

tl;dr version:
-Hi I'm S84 PATCH and I like Fire Emblem
-Is it normal for tilesets to have gray bordering lines?
-Is it normal for tiles to be 17x17 pixels?
-Can someone who's expirienced direct me to the tilesheet they use?
-I'll have more questions as I progress and I appreciate all assisstance!