electrostatic

hello all,
I have a simulasion on COMSOL resolution of the equation of fish (Maxwell's equations) electrostatic
My problem must solve this equation, we must obtain the charge density, current, electric potential, electric field, I only boundary conditions, I read several articles, I see that false use the PDE mode (weak form, general form, form coefficient), I could not use COMSOL, how to enter the equation COMSOL
what does the function (test) how to use
when I use the faibe form, general form, the form coefficient
why I use weak form
please give me a book title to read how to solve equations with Maxwell Elements finite, how define the boundary conditions, why use the Finite Elements (electrostatic)
please help me, give me a word or a website, anyone, to guide it, I am very very very interesting
please please please help me
I'm lost