Welcome to Fallout 4. When it comes to modding the game I highly recommend to take your time. Maybe it's a good idea to play the unmodded game a while before you begin to mod. Doing so you can learn what you are missing or what be nice to have or what would be a qol mod for you. There is neither the one mod to make everything better nor the one collection. Every recommendation I could make would be a matter of personal taste and does not mean that you would like it, too. There are some mods I would consider "must haves", but still it's only my taste. So maybe it's a good idea to go through the category section here on nexus and look for things that you want to have in general. Graphics enhancements, weapons, clothing, settlement objects, game play, character creation, etc.
It might also be a good idea to inform yourself about the so called next-gen update and it's consequences.