Yeah, pump your points into strength before you do your agility, so you can do damage. If a balanced build is 18/18, you decide from there if you want more damage and hp, or you want to be more agile. 18/21, 21/18, and 24/15 are all very solid builds.
Weaponmaster is arguably not important in a pure melee build, because at level 30, you will get 110 proficiency. Putting 3 points in will give you 130 or so. Putting 6 points, you'd have 156 or so. I want to urge your to experience high wpf when learning the game, but you'll enjoy yourself a lot more with the +14 hp from having the 7 Ironflesh.
Falka laid out a perfect build for you. I'd just recommend picking up 3 shield skill instead of 3 weaponmaster, just as a utility item you can carry to advance on ranged or protect yourself from a flanking archer.
Also, spend a little time in duel server and work on manual blocking. It becomes second nature with some simple practice, and if you'd want someone to spar with and show you a few things, add Uumdi on steam.