advice need

[advent]

hi
i am originally from afghanistan and coming over as asylum seeker to uk in 2001
i have afghanistan passport with a UK settlement stamp in my passport - leave with no limits or restrictions.
I wish to make application to bring my wife + child to UK from afghanistan
I am employed earn £13000 a year and have £2000 savings and i have never claimed any benefits
i live in council owned 2 bedroom property where i am paying £90 a week rent
i married in 2000 in afghanistan
my child is 6 years old now

pleas advice me how to make apply and what document i need and cost

And how i apply for uk pasport

any help be much grateful