Well, I am 1h+shield/cav, but I will share my build anyway.
21 Str
15 Agi
130 One Handed ( give or take a point, I forgot lol )
4 IF
7 PS
5 Shield
5 Ath
5 Riding
3 WM
I often play as just Infantry too and get good scores, not always, but no ones perfect. I use either a pick, iberian mace or my loomed Arabian cavalry sword.
When going against people on foot who use picks and maces, if I have my cavalry sword I use my range advantage pretty well, if you can keep them at the max of your swords range, which takes some practice, you can trick alot of players, by swinging and hitting their shield, but stepping back and swinging again with an overhead.
It's uncountable how many times I have done that and an enemy has counter attacked, but their weapon was too short to hit me and my sword was still long enough to hit them, thus they miss and I hit them. Also, the swords range combined with good footwork can allow you to break the chain of the whole "hit defend hit defend" pretty easily.
I'd say buy alot of weapons and see what you prefer most and how well you use them, but IMO you can't go wrong with a pick or a mace, they hurt and are perfect hugging weapons, especially for tight hallways and enclosed places and they have a nice easy swing feel to them due to being short.