OKAY!!! >:0

I wanted to make an articer/monk but i wanted to know a couple things..maybe people know the answers <.<

1: If i get whirling steel, would i still be considered "Centered" If i have one longsword and then a runearm?

2: Would Kamas or longswords be better?

3: Which levels? I was thinking maybe 17 Art/3 Monk for harmonious balance and other stuffs, evasion, ect <_<

4:Should i tank or should my pet tank.