Ok cool. For mods to make Npcs look better, I would suggest Beauties of Skyrim HD for females and Definitive Male Beauty Pack for males. Mind you, DMBP may cause some crashes in spots depending on how many other texture mods you include in your load order. Towns and City overhauls can cause alot of CTDs but if you insist on using them, you can look into JKs Skyrim. It'll spruce the look of the city's up a bit. For weapon overhauls you can check out Old Kingdoms overhauls. They have one for both weapons and armors that'll provide new textures and variations. You can also try out Heavy Armory. It'll add weapons such as spears, halbards, shortswords, etc, to levelled lists of each metal type. You can also try my personal favorite Amidianborn Book of Silence which retextures all vanilla armors and weapons with a fresh, new, updated look and its very easy on the system. For quests you can try Forgotten City, Project AHO, or Falskaar. I don't use quest mods so I can't really help with that but those are all top reviews mods. For perk systems you can try Ordinator, Vokrii, or Adamant. I use Ordinator and its great but if you want a simpler one try out Vokrii. Skyland AIO is probably the best landscape overhaul available but it takes up a giant amount of space. It covers pretty much everything and will make the game look brand new especially if you pair it with a lighting mod such as ELFX. And for water you can try Realistic Water or Cathedral Water. I use Cathedrals apart of a bundle and its great. Let me know if you need help with anything else. I may reply late but I will reply!