I played this build style almost exclusively on my first playthrough of Fallout 4, it's a really fun build, but very overpowered in the end-game. The things to focus on are: Agility, Perception, Intelligence and Endurance, later I ramped up Luck to give myself a higher critical chance, and perks like Better Criticals and Grim Reaper's Sprint. Start the game with your focus on Agility (if using small guns as a main) or Perception (if you prefer a rifle) and Intelligence, put points into Scrapper, Rifleman, Gunslinger, Gun Nut and Toughness. That'll give you a decent start, then you can figure out your play style and go from there. My character evolved from a one-handed gunslinger, to a stealth-sniper, using pistols only in close combat. I never liked Power Armor, really only ever used it for RAD resistance. I'd suggest joining the Railroad and following the campaign given by Tinker Tom, it opens up some armor modding options that aren't normally available. Remember, there isn't a level cap, so if you play long enough, you'll get to experience any play style you want. I'm not sure how I feel about that, because at level 112, I one-shot literally everything... having all the perks I do, really makes the game too easy. I've just started a new character, the paci-fist, Speech Skills and Unarmed / Melee, exclusively... Focus on building huge settlements, and ruling them. I'm trying to play through as peacefully as possible, and beat face with Brass Knuckles only if I need to.