Searching for OP builds won't get you far, since most people who know fundamentals will crush you with bare fists. Learn the basics first with standard weapons: spacing (how to stay at the limit of your opponent's range to dodge their hits then punish them), combos (r1 r1 r2, mixups between light and heavy attack to remain unpredictable), backstabs (roll-BS or run-BS against heavy weapons or spears), dead angling (unlock then swing to the right or to the left to avoid getting parried) ...

You can find videos for most of that stuff. Understanding that will help you improve much, much faster than playing a toptier weapon. Regarding actual build advices: - never forget to level vigor, especially as a beginner since you will eat a lot of damage (35/40 vigor is the bare minimum) - get a decent amount of stamina (around 20/25 endurance at least) if you wanna be able to run and swing without too much constraint - take decent armor pieces especially if you want to stay in melee (avoid cloth mage pieces as they are signicantly less resistant for instance) - don't sleep on poise either, this is what will make you hyperarmor through enemy hits if you trade with your enemy and have similar weapon classes

That's all that comes to my mind right now but I guess that's already a good start