https://ffxiv.eorzeacollection.com/glamours

This website is good for looking through glamors (Albeit some screenshots are very oversaturated/photoshopped). It lists all gear used, but you may have to do your own research on how to obtain that gear. As for the glamor dresser, simply applying a glamor plate doesn't cost resources. However, editing a glamor plate may consume dyes when you push the save button.

As for gear, well, it's a good idea to keep up at least for your first job. Crafted/vendor is usually a tier below dungeon drops, but it's definitely better than letting a piece get far behind your current level.

After you've leveled your first job, you no longer have to enter dungeons/trials/story instances, so you could just level through Palace of the Dead (potd) or PVP content - both ignore your gear. PotD is efficient for leveling, but can be repetitive. Otherwise, I'd recommend doing your roulettes daily to level up efficiently.