So before I put in builds, I'll throw in my top perks/traits/skills to use/max-out.

###Traits
 - Built to destroy is a must (Well, crits.)
 - Wild Wasteland if you don't mind losing the YCS Gauss rifle, you gain much more from it like the alien blaster for instance
 - Hot Blooded is for builds where you actually decide to run in full force and ignore everything (NEVER USE AUTO STIMPACKS WITH THIS.)
 - Four eyes if you are going to grab 6 perception and 4 charisma then get an implant for perception, it's a great option if you'll do sniper-based stuff (even tho I dislike it, the bonus by the way affects as a bonus not as a base stat, meaning you'll lose out on some perks unless you actually take the implant and the 6 perception)
 - And lastly Kamikaze, I generally take it as a swap for wild wasteland after old world blues, it's great IMO if you're not running a heavy armored character.


###Perks
 - Jury rigging (well, repair anything at all)

 - Silent running (Just lets you ignore the walking mechanic when crouching, great overall if you'll do any form of stealthiness)

 - Hand Loader (While I really dislike it, it's REALLY IMPORTANT.)

 - Better Criticals and Finesse (Just boosting the crits, generally helpful)

 - Sniper/Center of Mass/Hobbler (This is only when you're willing to go into VATS very often, I'd stick with Sniper only unless full automatics or high spread)

 - Confirmed Bachelor/Black Widow (Because most of the characters in the game are male, ALL Legionaries are male)

 - Action boy twice with Grim reaper's sprint (again, VATS since you're a bit rusty on the game, will improve combat drastically.)

 - Nerves of steel (Same reason as above.)

I just like to mention that you can almost never run out of Action points if you know what you're doing and can get a kill out of 1 or 2 shots in VATS

###Skills
 - Guns, max it out ASAP (Yes, MAX IT OUT)

 - Lockpick, go for 85, important since you can abuse magazines later on for lockpicking and whatnot

 - Speech, go for around 55 to 80, generally a skip-through for most of the quests

 - Barter if you don't plan on gathering a bunch of caps

_____
Now for the builds.

##Sniper build
SPECIAL : 

 - Go for strength of 7 with implant
 - Endurance of 7 with implant
 - Perception of 5 or 6 Depending on if you'll take four eyes
 - Charisma is 1 just cause you'll almost NEVER rely on chatting your way through stuff, remember you're a sniper you hate people, Roleplay it if you wish
 - Agility of 8 + Implant
 - And luck of 9 + Implant

**Perks**: 
All of the perks mentioned above + Light touch and one of the level 50 perks (preff the one with good karma) also if you want something for close range, just grab the riot shotgun with shotgun surgeon and the stay back perks

**Skills**: Guns is maxed, speech ignored, lockpick maxed or at 85, science at 60, sneak at 90, repair maxed, everything else is optional if you have the skill points

**Apparel**: 1st recon beret, Ulysses' Duster, and generally any eyewear that increases crit.

**Weapons**: As I said before go with riot shotgun, then the choice of the sniper is optional but I REALLY ENJOY the Gobi scout rifle if you know they won't come close to you or CoS Christine's sniper from Old world blues near little yangtze (found in the destroyed building's 2nd floor)
IGNORE THE ANTI-MATERIAL RIFLE. That gun is as shit as anything else, has a very slow fire-rate, has a very long reload time and generally is only used if you'll do 1-shot kills ONLY, also with the Gun Runners' Arsenal you can get the explosive rounds if you wanna be an asshole but that's just personal preference 
Also the YCS Gauss rifle is superior same is the Holorifle, I just dislike energy guns
Ratslayer early on, and you're set

## The Sneaky biatch build!
Okay so Special is not so important as long as you have 9 agility and sneak
Sneak at 100 with guns/energy also at 100 (Depending on which will you use)
unarmed and melee at 80.

Get sleepytyme, CoS Sniper, Oh Baby or Knock Knock (see the fallout wiki for those) with the two-step goodbye/industrial hand, you're set to go, just go ahead and sneak your way with a huuuge crit boost from perks and everything (Mentioned in sniper build and general best perks) and if you take the stealth suit MK II from Old world blues plus lily as a companion, you'll laugh your ass off with the amount of times you'll hit people without being noticed, it's by far the 3rd most fun just behind the assaultman/demolition man builds which generally emphasize on abusing assault rifles and light machine guns or Fatmans, grenade machine guns, missile launchers, etc...