1. Download the pack and extract it then change the pack.mcmeta files descriptionto whatever you like
2. Put the pack in your resource pack folder and Make sure when you open the folder the pack.mcmeta file is there and that theres a folder called assets
3. After that you can get to texturing just open the asset folder go to textures and edit the files in the Items Folder or Blocks Folder or Entity Folder
4. If you want to edit armor texture you have to go to Assets>Textures>Models>Armor you should look up a tutorial for the armor if you dont know how to texture it.
5. If you want to change the pack icon texture you can open the main folder and edit the pack.icon you should probably also just make a new texture if you dont like the pixel size then just rename it into pack.icon
THIS IS JUST A BASE TEXTURE PACK YOU HAVE TO MAKE YOUR OWN TEXTURES!