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I'm trying to implement task ( processes , threads, etc.. ) in my OS, but I got some doubts and I would be very happy if somebody helps me. I want to know if I need a thread for my kernel ( since it's the main console ) ??

Well I'm pretty new to OS development, but after some reading it became clear to me that your kernel and your console should be 2 different things. A console is usually a seperate process that calls kernel functions for executing commands/programs.

I'm currently figuring out memory management stuff, which is one of the most important things you must do before implementing threads, etc.

So if you haven't done that already, I suggest you start working on a good memory manager that supports Segmentation and/or paging. These mechanisms help you protect one process from another + it gives you some flexibility in loading your application.

ok, thx for the reply
so, I'll need to write a console in another file that can be loaded and executed by the kernel ?

It is normal (I say normal here meaning UNIX-like) to spawn your first process, which will fork and spawn other processes (drivers, daemons etc) , one of which is a shell. That would provide console support by interacting with your kernel through syscalls.