Edit :
For example at level 5, if you plan to play with katana, you should put as many attribute points into Reflex (i.e level 6 with the character creator and 4 by level up. So at level 5, 10 in Reflex).
Then, normally, you should be able to aquire "easily" the very first Sandevistan > Dynalar Sandevistan Mk.1 (Reflex level 6 - 14 Street Cred - NorthSide at Cassius Ryder).
Then invest as many perk points as possible into Blade skill :
- Sting Like a Bee (Increases attack speed with Blades by 10/20/30%)
- Roaring Waters (Strong Attacks with Blades deal 10/20/30% more damage)
- Slow and Steady (Moving while wielding a Blade increases Armor by 15/30%)
- Flight of the Sparrow (Reduces the Stamina cost of all attacks with Blades by 30/50%)
- Offensive Defense (Defensive Attacks with Blades deal 75/150% more damage)
- Shifting Sands (Dodging while wielding a Blade restores 15/20/25% Stamina)
- Stuck Pig (Increases Bleeding duration by 3/6/10 sec)
- Blessed Blade (Increases Crit Chance with Blades by 10%)
- Unbroken Spirit (Successful Counterattacks with Blades restore 25% Health and Stamina)
And finally, upgrade your katana regularely. Early game, the best is probably the Black Unicorn (GOG reward).
So if you don't, you will have a hard time to play with katanas, that's for sure... If you do, well, you'll quickly being very powerful