[quote=@Bishop]
Oh and, what is the max number of weapons I can have? if I don't choose a magic do I get to add a 4-th weapon if the number is limited? can I have 3 blades instead of blade pistol?
[/quote]

The max number of weapons anyone can have is 3. Even if you don't choose magic, you cannot have more than 3 weapons. You can have 3 bladed weapons by all means, but it is heavily recommended you take at least 1 firearm as well.

[quote=@Bishop]
[@KoL] So does it mean that I get the debuff from the magic AFTER* I have used it? Or do I get it simply by having it?
[/quote]

You get the drawback simply by having it. However, the drawbacks get more severe with the more you use your magic.