/vr/ - Retro Games

hi lads. wanted to get into doom mapping. downloaded a texture pack so I wouldnt have to use the default doom 2 one. I read the slade tutorial to import textures but i still get invisible walls and shit when i try the wad. can anyone point me to a retard proof tutorial for the textures? im tearing out my hair here. also I dont understand the deal with duplicates and what i should do with them. I feel fucking retarded