Questions about Assassion equipment

Hi to all.I have Assassion 55 lev at the moment and i start to collect Anuhart Set but i have this questions :

1. I'm at the moment wit 2 Fenni's Sword that i buy from the site du they are good for me for now or i need to change if i need give me a sugest wit what to change.

2.I want to buy earings , rings and belt but i dont know for what to collect money to buy what is good for me and what no.

3.For now i fill my items slots wit mag acc 14 , crit strike 17 and att on the sword +5 du i make mistake that i dont use other stuff or to stay on this combination ?

4.What is the best Sigma to use at my level becouse i have so many but dont know what to put to use and what remove.